Why are my tomato plants not making many tomatoes?

Try hand pollenenateing the flowers, use a soft artist brush and swap pollen from one plant to another.

Stop fertilizing so often. Over fertilizing will produce beautiful healthy plants, but no flowers or fruit. Over fertilizing is as bad as under fertilizing. You might also try hand pollination too.

I agree with Naomie. Your feeding the plant and not producing flowers or fruit. Once you have some blooms shake/tap the plants lightly to spread the pollen. I grow mine upright on a pole and just tap the pole to spread the pollen. Also pinch off any suckers that grow in the crotch of the main stem and a side branch.

https://www.thespruce.com/should-you-prune-out-tomato-suckers-1403290

you are feeding to often and tomatoes do not like "wet" feet, so if you are watering to much you will get tall spindle plants with no fruit. good luck.