Is there any promo code or bonus for newbie or free small credit for new account?
At the moment, there is none but you can check other promos at
https://metawin.com/promotions/If you're also a VIP in another casino, I do know metawin team is gearing up for another season of VIP transfer -- that is, if you can wait until then.
Another question is there other option to deposit crypto than using Web3 wallets? I am in the middle of account creation the web3 wallet keeps asking.
Yes, there are two kinds of wallets in metawin: web3 and custodial. You can also create an account using your email if you don't want to connect a web3 wallet. However, keep in mind that custodial wallet has a lower withdrawal limit compared to web3. The latter is more frictionless as well.