By arena do you mean naughty mansion? Because if i remember correctly i don't think arena unlocks any new characters correct me if I'm wrong tho.I got banned once, and I think/guess/read from the Internet, the ways of avoid getting ban are two
1. don't touch the arena
2. dont spend too much diamonds in a short time, like gacha a thousand times in a day.
and back to 1. "not to touch the arena" is kinda tough since many characters needs to be unlocked through playing the arena, so... yes, to avoid ban you may need to slow down your play speed and also can't play some contents
hmm... do you got any ideas?
Also this time was the same as last time i got banned after one day after unlocking the character andriella and especially this time i tried not to speed run any content and only used gacha if the items were limited duration. Another thing to notice is i was still on version 1.2.134 when ver 1.2.135 was a day old i ignored the update because 1.2.134 worked fine and the app didn't prompt to update like it usually does.