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It may be a fungus or aphids. I like neem oil as it is organic, safe for people and beneficial bugs but effective on pests. It's also an effective fungicide should this be your problem.

Could you be watering it too often? Hopefully this article will help: https://www.gardeningknowhow.com/ornamental/shrubs/esperanza/esperanza-plant.htm

Give the tree that's not blooming some bone meal or use a high phosphors fertilizer. That should make it have more blooms.;

The soil could be lacking sufficient phosphorus, which is responsible for blooming in most cases. Try adding a higher phosphorus fertilizer (like Bloom Plus, Bloom Booster) or add bone meal to the soil around your plant. Here is more info that may help: https://www.gardeningknowhow.com/ornamental/shrubs/esperanza/esperanza-plant.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm

It does not need pruning before winter. It is recommended that you wait to prune this plant until right after the blooms have faded.

There are a number of possible reasons why leaves on your pepper plant would turn yellow. (BTW, that's Esperanza pepper; Esparza is something completely different) This article gives you a rundown on the common ones: https://www.gardeningknowhow.com/edible/vegetables/pepper/pepper-yellow-leaves.htm
If you need someone to actually look at your plant and give you advice, you can take leaf and soil samples to the nearest Extension Service. This article will help you find one: https://www.gardeningknowhow.com/garden-how-to/info/what-is-extension-service.htm