Q.Tomato Not Setting Fruit
I know this must be pretty common but I want to understand it more. I have a tomato plant with trusses of flowers and somehow none of them becomes the fruit. Here’s the thing, the tomato flower is pollinated since it did not fall off the plant, it just stays there with the ovary not growing, it never sets fruit. Now I am sure I fertilize it well by drenching it with water mixed with fermented fruit juice every week, and foliar spray it with fermented fruit juice once a week. Rain? I have a UV plastic above it. Can anyone help me?

Certified GKH Gardening Expert
Unfortunately, your photos did not come through. I am unable to see the situation to get a better idea of what is happening.
There is one major step that you should take, first, though. I would test your soil nutrient levels. Typically, if everything else looks good, the plant is healthy, and the temperatures are within range for proper fruiting, then soil nutrients can be to blame. Sometimes having too much nitrogen in soil will prevent proper fruiting. Also, a pH imbalance could be the culprit. Testing the soil will reveal all of these pieces of information.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/test-soil-for-pests-and-diseases.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/making-sure-soil-drains-well.htm
The next thing to consider will be the UV cloth. They need lots of light, including UV. Not receiving enough will lead to flowers, but no fruit.
This article will help to understand the many factors that will cause this complicated issue:
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossoms-no-tomatoes.htm
Finally, this article will help you to understand what tomatoes need to grow to their potential:
https://www.gardeningknowhow.com/edible/vegetables/tomato/growing-tomatoes-guide.htm