Bonsai has gone yellowy so i repotted and trimmed what else should i do

hit the wrong key. What I said was not looking good is an understatement, it looks very dead to me. re potting was the wrong thing to do, it would only have made it worse especially out of the correct time for doing it. I can't see it surviving. I would suggest it has been allowed to get dry for a long time.
Sorry, keep the pot the tree is gone,
Geoff

Your tree is dead.