I haven't had very good luck with bell peppers of any kind. Jalapenos and habaneros will give me oodles of peppers, especially the habs. But you don't need many of those because they are soooo hot!My peppers didn't do much of anything. I think I got 3 total peppers out of 8 plants.
I'm to the point where I'm not going to give bell peppers the space. Maybe a couple, but that's probably it.
If you get your soil tested, let us know what they say, and we can help interpret. They'll probably test for pH (acidity/alkalinity) and the Big 3: Nitrogen, Phosphorous, and Potassium. They may test for other things too.
When you buy fertilizer, you'll see numbers on the bag, like 10-10-10. That refers to the Big 3, and they are abbreviated N-P-K. They may not have the letters, but they always refer nitrogen, phosphorous, and potassium, in that specific order. So that 10-10-10 is called a "balanced fertilizer" because it has all three in the same percentage by volume.
If your soil was very lacking in Nitrogen, you could add something like bloodmeal, and the numbers on the bag might be 24-0-0. Then you are adding Nitrogen, but not the other two.