That kind of changes things,
Take it to the shop change oil, get them to check it out,
( if that possible here) tell them what happened.
Take it to a field ( for soft landing ) put helmet on, long pants, gloves.
jacket and abuse it, (big style) , at low speed stamping on the gears. up down through the gear box, waking the throttle wide open as you change gears. if it works ok, then just use it.
I know you have tried this but get rough with it, this time.
sorry it's all I can suggest.
or sell it, but could be, not so nice for who ever buys it.