Good point ! I used also some coinjoins in the pre-fork era. But once the LN was well established, I stopped doing it, I realized that I could put my sats in a better place to work.

DarthCoin

bitcoin_beginners

What mistakes have you done with BTC?

Bitcoiner1

I do not say I should have bought it earlier (though I wish I had) because that is the nature of the beast. You get it when you get it. 

My main mistake was wasting a lot of time and sats on half assed privacy measures. Buying at atms or using mixers -- if your main use case is buy and hold, I suspect you are better off just being careful when the time comes to spend, rather than on the way in to your cold wallet. Coin control can do wondrous things. 