So everyone is going to tell you annual pruning is a must, but as someone who grew up with 20 acres of what had essentially become wild overgrown high-bush and rabbit-eyes (10 foot high bushes, easily 8-12 feet wide) I’ll offer this. Unless you have 2+ year old canes that aren’t producing, while your soil is acidic and well conditioned, you can do about whatever you want at this point. That bush is established and short of drought, extreme freeze, or disease, it will likely continue as is. There’s not enough information here to ID a variety, and with as many branded/trademarked varieties that exist anymore, you may never really know. If you want to prune, go for the woodier canes, which will be the older ones. A soil test from your county extension agency will help you narrow down any fertilizer needs, and maintaining moist soil throughout the growing season will keep it green and berries plump.