I'm not very good at... bookkeeping and such things make me sleepy just hearing about them, but honestly, not keeping records when filing at the end of the year is the real nightmare.

Right now, I basically have three things: screenshots of transactions/deposits and withdrawals from the exchange and exporting spreadsheets to the cloud regularly; categorizing on-chain addresses and labeling them (this one is an airdrop account, this one is a daily account, don't mix them); each time I cross-chain or claim incentives, I casually write a note, otherwise in a few months I only remember that I was a "mining tool" and can't recall what that transaction was for.
In governance, I'm most afraid that incentive design will push people to become short-term traders, and on the tax side, I'm most afraid of pushing myself into amnesia... Anyway, just keep the chain of evidence, don't rely on "I think it should be" to explain at the end.