Since best practices these days is to generate new receive addresses and never reuse them this feels pretty painful to me. But I appreciate it is a hard problem and the desire to really track absolutely everything.

But those BTC have gone through so many wallets since I first got them that I really don't have a full record, so please add a way for me to say "no, this isn't a sell and no this isn't a buy" instead of requiring a full trace of every address I've ever touched.

If you count transfers out as sells unless you see the transfer received in a wallet, and if you don’t support wallets for most of the coins, how should I avoid these (ex. sending Neo from an exchange to my wallet) getting counted as fake gains in my tax report?