Combination of Koch and Farnsworth is how I've learnt morse code in the last year. Has been a challenge at times, but keeping the speed up makes a huge difference. The struggle I still have is catching words my just listening.

Also worth pointing out CWops https://cwops.org/cw-academy/ and the Long Island Club (it's all online) as a classed based way of learning. CWops is intensive but very effective