These days, everyone is talking about sandwiches and arbitrage, and honestly, you think you're making money, but most of the time you're just paying others' transaction fees. That moment on the blockchain when you see "I just confirmed and the price has floated," it's probably not your hand shaking—someone else is faster and better at queuing.

Now I check the slippage and pool depth before placing an order; I don't chase that one profit, and if I can set a limit order, I do. Don't treat yourself as a testnet score chaser. By the way, the recent testnet incentives/points system also seems pretty similar: you think you're saving for the future, but maybe you're just helping the project do stress testing and make the data look good... (bullet comment: whether the mainnet issues tokens or not, no one really knows). Anyway, my attitude is: if I can participate, I participate; don’t treat "opportunities" as your main source of income.