I have recently been using a decentralized exchange that offers a very smooth operational experience, called Nekodex, developed by the $PERP team.
✅ No Gas fees
✅ No need for a mnemonic phrase, no need to install a wallet
✅ Supports cross-chain trading
✅ Customer service is also very responsive
If you like DeFi but dislike complicated processes, I recommend you try Nekodex; it's really easy to use.
(I am a Nekodex user #14888049, feel free to ask me if you have any questions!)