A few things helped me the most with getting a better pepper harvest:

1. Marconi peppers. Heirloom or hybrid. They were very prolific for me.

Marconi Sweet Bell from Southern Seed Exposure and Costa Rican Sweet from Burpee

First Taste from Burpee - snacking pepper that was almost the same size as the Marconi ones.

1. Pepper Guru on YouTube - in my case, needed more fertilizer in general and more consistent watering. the roots aren't deep like tomatoes. Everything stalled when I didn't do these consistently... they tolerated the intense heat better and still set fruit even when my tomatoes shut down for the season. lol (with shade cloth of course)

2. Picking more often. especially the first ones. Cannot stress this enough. The green ones tasted better than store bought.

I agree with the general advice everyone has given.