In season 7, we could see Godspeed wanting infinity speed, so he would want to steal the speed of all speedsters. Team Flash would want to protect the speedsters, so, they would track all the speedster from the universe. They would discover that the Speed Force Storm that was created when Speed Force was needing a speedster, created new speedsters, and Godspeed was one of the speedsters created. One of the speedsters created would be Meena Dhawan, a scientist. Godspeed would want the help of a scientist to help him get infinity speed, so, he would use equipments to manipulate Meena's mind and make her help him. Barry would discover Jay is in Earth Prime so he would ask his help to fight Godspeed and protect the speedsters. Jay would help Barry and with him would be his trainee, Patty Spivot. In Earth 1, Patty would have been struck by a lightning in the Speed Force storm and would have become a speedster. Jay would have been training Patty from Earth 3 before Crisis on Infinite Earths. After crisis, Earth 3 Patty's history and Earth 1 Patty's history would have been mixed in only one person, Patty from Earth Prime, so, after Patty gained her speed by the Speed Force storm in Earth Prime, Jay started to train her. Patty would help Team Flash to find the other speedsters created in that night as the hero Miss Flash. Wally would also help Team Flash. Team Flash would find two speedsters created in that night, Avery Ho and Max Crandall. Team Flash would tell Avery and Max about Godspeed and both would not want to be only protected, they would want to use their speed to fight Godspeed. Team Flash would agree and both would become heroes. Team Flash, with Max Mercury (would be his codename), Kid Flash, Avery Ho and Miss Flash would defeat Godspeed and would save Meena from the villain's mind manipulation, so she would join them as Fast Track. At the end of the season, a speedster from the 23rd century, called Sela Allen, would warn them about a new threat... (then season 8 would start)
Sela would be a descendant from Barry and daughter of the Flash from the 23rd century (Sela would have inherit her father's speed but wouldn't be a hero). The 23rd century would have been attacked by the villain Cobalt Blue. Cobalt Blue would have killed Sela's parents and would have seriously damaged Sela. Sela would have entered in the Speed Force, in attempt to regenerate herself from the damages, but she would have been stuck in the Speed Force and would have been able only to project her image in the reality as a manifestation of the Speed Force (Sela's projection would have super-speed). Sela would have come back to the past because she would want to warn the first Flash about Cobalt Blue, a villain who would want to kill all Allen Family.
Cobalt Blue would actually be Eddie Thawne. Eddie's grandmother would have had a ring that gave her the power of the Blue Flame. She would want to Eddie inherit the power so she would have given Eddie, the ring, but wouldn't tell him about the Blue Flame because she would know someday he would discover by his own. The Blue Flame ring would be the ring Eddie said in the first season his grandmother gave to him. When Eddie died, the blue flame from his ring would have resurrected Eddie and the wormhole would have sent him to 23rd century. In the 23rd century, Eddie would have discovered that he was actually Nora Allen and Henry Allen's son, Barry's twin brother. He would think they abandoned him and then Thawne Family adopted him, so he would want to kill all Allen Family so he could get revenge for them to abandon him. He would start killing the Allen Family from the 23rd century (Sela and her parents) because he would be there. Before killing Sela's father, Eddie would have stolen his speed, so he could come back in time and kill other generations of Allen family.
In the present, Sela would tell Team Flash what is Cobalt Blue's probably next target. It would be the generation of Barry's children and grandchildren.
Sela and all the speedsters from Team Flash (Barry, Meena, Max, Wally, Patty and Avery) would go to the future where Cobalt Blue would probably attack.
In the future, ater Nora was erased from the existence, Barry and Iris' children in would be actually Don and Dawn, who would have inherited their father's speed and would be the heroes Tornado Twins. As Eobard said in the Flash 5x9, Barry and Iris' daughter should be Dawn. Dawn would be married with Jeven Ognats and would have a daughter, Jenni Ognats, also a speedster and the hero XS. Jenni would have been Nora West-Allen, but after she was erased from existence, she would have become Jenni Ognats and instead of Barry and Iris' daughter, she would be their granddaughter. Don would be married with Meloni Thawne. Meloni would be President Thawne's daughter and President Thawne would be Eobard' brother. Meloni wouldn't agree with the Thawne family so she would have rebelled herself and would have married Don, that is from Thawne's enemy family, the Allen. With Don, Meloni would have a kid called Bart Allen, also a speedster and the hero Impulse. President Thawne would not like his grandson being a hero so he would create a clone of Bart using his DNA called Inertia. Wally would have married Linda Park (Barry ex-girlfriend) and would have the twins, Irey West and Jai West. Both would have inherited their father's speed and would be heroes.
Barry, Sela, Max, Meena, Avery, Patty and Wally would explain Allen family about cobalt Blue and they would be willing to fight him. Together, the speedsters from past and future would call themselves Flash Family.
In the same time as Barry would be with the Allen family, his twin brother Eddie, would be reuniting the Thawne family. President Thwane, Inertia and Eobard Thawne would join him to defeat Flash Family.
There would be a war between Flash Family, leaded by Barry Allen, and Thawne Family, leaded by Barry's twin brother, Eddie.
(If I wrote something wrong, I'm sorry, I'm brazilian, and please correct me in the comments)