dont putt to hard when you are close to the hole

Practice. On various greens to test your abilities at various speeds. Check the loft on your putter periodically, leaning on your putter on the green his not a good idea. I get mine check at least once a year. Practice putting from all distances. Your tempo and grip pressure are important. Trust you stroke and learn to keep your head down till you have finished your follow-thru.

Keep the putter head low on both the takeaway and the follow-through. Target the back of the cup.

Putt with eyeline directly over the inside edge of the ball, find grip that reduces wrist movement and focus on shoulder, back, and core activation.

Also tempo. Practice with a metronome or rhythmic beep/noise that you can follow along to and work on keeping your stroke at a consistent tempo