Silver blood

After a fatal car accident at 4 leaving her parentless Elouise Silver is left to go to foster care. It was only then when Terrance silver found out about his granddaughter. The man eagerly adopts her and treats her as his own. 12 years later he has a visit from an old friend asking for help with his karate dojo. Elouise didn't realise how much her life would change after moving down to the valley

This doesn't follow the exact timeline of cobra Kai.
Begins from season four ep1

Oc x Eli Moskowitz/ Robby Keene