Am in GTA Online Lvl about 400+ and play the game since the PS3, but if I change my name now (which is possible) what would happen? Would my score be deleted or could I still gamble without any problems?
Can continue to gamble without any problems
There's an official list of games that have none, minor, and serious problems. Look in here.
Do you know that for sure?
If your GTA 5 account is linked to Ps3 and Ps4 then there will be problems.
If not, then not.
I already said to Gta that there would be moderate mistakes, but I do not know what that means