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https://www.gardeningknowhow.com/edible/vegetables/pepper/pepper-yellow-leaves.htm

Yes, there are plenty of remedies that you can use. Most can be crafted out of things that you already have around the house. This collection of articles will help: https://www.gardeningknowhow.com/special/organic

This article will help you.
https://www.gardeningknowhow.com/edible/vegetables/pepper/pepper-yellow-leaves.htm

This does sound like mites. There are many ways to get rid of mites. Neem oil, hot pepper extract, chrysanthemum oil, and rosemary oil are some of my go-to's.

This collection of articles will help: https://www.gardeningknowhow.com/special/organic

You can pick it now, but it may be a little on the bitter side. It will turn colors on its own, and you can pick it a little early if you intend to store it for a few days before using. It is always best to allow it to ripen for the best flavor, though.

They are mushrooms! This is due to the soil remaining wet for too long. This is likely because of the materials covering the soil. This paper should be tilled in, or removed prior to planting.

This soil should be allowed to dry out throughly. Although those mushrooms are not harm to your plants, they are a sign that there is a good bit of rotting material in the soil

This will be what is, also, causing bloom drop.

I would recommend removing the covering material from the soil and treating with dolomitic lime and wettable sulfur. This will kill off anything bad in the soil, as well as condition the pH and contribute calcium and magnesium.