Positive mental visualization. NO negative visualization.
A little meditation/ deep breathing/ centering before climbing, along with that visualization.
In rock climbing, where leader falls are acceptable due to the different scenario/ gear, I was taught a mantra by a guy that I watched waltz up a 5.11c/d trad route (aka f'n hard with fall protection only as good as you make it): Climbing is fun, my gear is good, falling is safe. Adapt to the situation.
Do some no pressure climbing, be it work or play, with some swinging around, etc, where you have to trust your gear. Maybe some of that aggressive type of speed climbing that you like, while independently belayed, making sure your belayer is solidly anchored (in the event its someone equal in weight or lighter than you, you don't want to launch the belayer).
Add time and implementation of the ideas above, and some more time.
I took a very unplanned 30' rock climbing fall from 33' one time breaking my foot a little (it wasn't the fall but the rebound up and toward the cliff). It took a long time to rebuild. Too much negative visualization afterward, and reluctance to put myself in the similar situation, safely. Too much pressuring myself.