I haven’t really hit a brick wall with any particular technique — but alternate picking has definitely taken the most time to develop, and still takes the most upkeep. It’s one of those things that slips if you don’t stay on top of it.
Curious how it’s been for you. What technique has taken the most work on your end? And did anything finally help it click?
Would be great to hear what’s worked (or hasn’t) for others here.