My experience is that you have to match the tomato to your (micro)climate. I was not getting sweet/tasty tomatoes until I started buying seeds from a local tomato breeder who kept making hybrids until he had varieties that did really well in our area. You might check and see if there is anyone in your area doing that. If you have a master gardener program in your area, they might know of them. You could see if anyone in https://www.reddit.com/r/tomatoes/ is in your area and has some tips.

My ex-MIL grows Home Depot bought Early Girl tomatoes and they are so sweet I cannot use the sauce as sauce - I make ketchup out of it. Where I live (about 40 miles away), I can never get them so sweet, so I use some varieties made for my climate.

The other suggestion I have is to make sure your soil chemistry is good and your are feeding them well and chucking compost at them.