You've been using a payment processor as a wallet? That's a genuinely awful idea. It's a terrible idea to use any site to store cryptocurrencies. There are many, many options that give you full control over your coins.

Let us know what coins you want to store and what your situation is in terms of how you access the internet - computer, phone etc and you'll get some useful answers.

If you want to accept crypto for payments then this is what you need - https://btcpayserver.org  especially in a place like Bangladesh. Again, it lets you be in control.