How to track crypto income properly?

Hi so i made a recent post talking about how i dont want to get fucked by the ATO. ive never reported (crypto gains/converts) to the government and especially not familiar how it is with the ATO since im from Denmark.

i asked Chatgpt "where can i track my crypto and then report and send everything in one go?". it said a service like Koinly or Cointraciking.

Right now im receiving on coinbase. but i do plan on switching to Receiving on "COCA" only as it gives nice cashback bonus of 6%. Quick side note: is there a better place to store crypto, bonus wise etc?

but Yeah im confused. i could technically just look at the crypto i sold, but how will i be able to know how much it rose with from the date of purchase? man i cant see how that gonna be possible