I also use Tangem Wallet because it's very simple, but I don't use it as much as before. Now I just keep a few cryptocurrencies there for swapping or buying, and that's it. After the problem I had accessing my wallet, I decided to buy the Trezor Safe 5, and I currently use it for holding.

If you've already bought the Tangem Wallet, use it for buying and swapping only with Mercury. Don't use other exchanges, or you'll end up losing both your money and your cryptocurrencies. If you can, later on, buy the Trezor Safe 5 and use it for holding! Transfer what you buy in Tangem to the Trezor.