Howdy! Yup, we have been commiserating on our beach sand that masquerades as soil, over on SS. You are on the right track, it takes lots of organic material and compost. I'm on my 3rd year and this year is better than the previous two. If all I had to do was tend to the garden, then it would probably be a lot better, but we bought 8 acres with a double wide and nothing else. We have worked our tails off making this place into our little farm.
All around us is red dirt, you know the rusty red iron ore dirt that makes white horses look orange! Right across the road is red dirt, but we and several of our neighbors have sand. Around here they call it sugar sand, it is fine and white like sugar. With no humus in the soil, the sand heats up under the searing hot sun, roots wither and the plant dies. The more compost you can add, the better. It will take some time, but just look at the beautiful garden you have! You have already done outstanding. It can only get better.
TEG is where you will learn more about the different varieties of vegetables. We get into some great discussions as we laud or lament what tomato, okra,corn or cabbage variety we planted. TEG is a lot of fun, because of the great people here! So glad you decided to join us.