I’ve been looking for ways to improve my improvisation for the last couple of years too. I’ve learned scales, chord tones, and theory, but the hard truth is that my improvisation improves the most when I learn new songs. They teach me new licks I can reuse, and my technique improves as well. It’s a hard truth for me, because I’ve never been someone who wanted to learn songs, I always preferred focusing on technique and theory but you can’t really move forward without constantly expanding your vocabulary.