I've recently been using a decentralized exchange with a very smooth operation experience, Nekodex developed by the $PERP team.
✅ No gas fee ✅ No mnemonics or wallet installation required ✅ Supports cross-chain transactions ✅ Customer service response is also very fast
If you like DeFi but don't like cumbersome processes, I recommend you try Nekodex, it's really easy to use. (I'm Nekodex user #04289119, feel free to ask me if you have any questions!)