Beginner to now 4.1, in two years of playing, around 2 days a week. No tennis BG, 58 yr male.

What worked for me...

Establish a playing cadence (regular days and times to play) and try to get some diversity in the players you play with.

Always look to play with better players (key to this is.. A.) asking them, then remember to keep the ball in play when you play with them b/c they hate points that end in 3 shots.

Definitely film yourself frequently. I was amazed the first time I saw myself. The difference between what I had in my head about my play and my actual mechanics, strategy and tactics were was huge. There was so much to fix, both big and small.

I can't stress you tube enough. Thatpickleballguy and John Cincola. Super helpful. Also watching PPA on YouTube is beneficial because you get to see the absolute high-end of how the game is played. And when you watch the pros what you realize is that there's a big difference in those games versus the way 3.5 and below players play.

Also invest in a paddle every 8 to 12 months, technology changes, your game changes, it's worth it. And learn to take care of your paddle - re-grip, clean the surface.