Over the years I've had periods of difficulty with all 5 of the major lifts.
Some were due to maturity or lack there of, aka ego
Some were due to listening to gym gurus. This caused a lot of confusion about technique.
Some were due to the growth phases and getting taller.
In the case of the Snatch I was taught "jump up - jump down" which I followed into my late 30's. This greatly limited what I eventually could pull.
A few years ago I started adapting my sandbag clean technique to my Oly lifts. Then I saw Coach Don McCauley's "catapult" technique. That helped me refine my technique.
"There's no such thing as shaping and toning. Only stronger and weaker." -Mark Rippetoe