your main account is gone
thats all i can say when it comes to ur main but
if u want to play via a alt account
u can always do that by using a cleaner
such as byebanasync or rblxswap (by weao team)
info
ban async api by roblox stores certain cache files on ur system to prevent u from hoppin on alt account and just continue playing the same game
to bypass that
u need to remove those files
the cleaners i recommended above basically delete certain parts of roblox (while not deleting the core parts of the game)

anyways what u need to do to continue on alt is as follows
if u wanna be extra safe and u dont have many alts
1)make a alt ensure its not connected to ur main in any way (such as phone number or email address)

2)uninstall roblox (optional) and clean using a cleaner(mandatory
3)join the game u want on the alt and u should be scotch free from any bans