Honestly, I do not recommend multi-accounting, it is highly risky, if you have been limited on the casino where you play and really want play more, I suggest you contact the customer care to see how such limited can be lifted, but in a situation where the account limitation is permanent, it is better to look for another casino to join, than going the multi-account way, you can loose both your capital and profit if you win a huge amount of money and you are required to verify your account before withdrawal, and you can't because you've use the documents to very the first account.
So Better to join another casino than stay with one and have multiple accounts.