free now. What's next?

I've been doing my daily stretches with my lacrosse ball for a month now. I think my back is finally free because the pain in my sternum has decreased significantly, the area feels more relaxed, and my back feels much freer. Also, it hurts much less when I throw myself on top of my lacrosse ball, and there are very few spots where it hurts, and I have to lift my hip to feel it. So now I'm wondering, what's next? I'm afraid to do something and make it worse. I know I need to do mobility exercises, strengthen muscles, and so on. But specifically, what do you recommend I do? Exercises? Mobility? Should I just keep doing stretches on my lacrosse ball for a while longer?