Can you tell us why exactly you are doubting that the principles described on those books do not apply to the market of cryptocurrencies? I do not remember ever reading a trading book from Schwager, but I have read books from Elder and Bollinger and they are quite good, so in my opinion anyone that were to follow their advice to the letter and grew as a trader with them will do well in any market, so do not give up just yet as you seem to be on the right track.