I am adding soft fruit and fruit trees a bit at a time here at our place as well. I have to contend with sea air, but we are lucky that part of our land is more wooded. I hope one day to start actively addressing this wood to make a mixture of a wooded pleasure garden but to use the understory planting or soft fruits. Blueberries do very well here in our well draining acidic soil and we have many natie ones, My current ones are in my small plastic greenhouse to save the crop from the birds, but at the end of the year I'll put them in the ground and do this each year.

Have you tried leaf mold? Composting Autumn leaves makes an excellent rich soild and I even mulch with the full leaves not shredded and then just top dress it with some other mulch to hold it down and it breaks down and enriches the soil. Of course soil is different everywhere.
Good luck.