Technically skilled but theoretically skill-less. Where to start?

Ive been playing for around 15 years and technically I am able to play most of what I can get my hands on. Recently I've been learning a lot of A7x and I find that is where im comfortable skill wise with the occasional dip into Dream Theater and Polyphia to remember I still have so far to go on my journey. My issue is that for all these years I've just been pulling up tabs and learning the songs or watching a youtube video and copying what they do. I don't actually know what or why im doing the things im doing. I can make cool sounds with my instrument but I dont feel like I actually understand it. Where do I go from here? Ive tried to get into theory and took classical guitar for 2 months to try and learn but everything seems to build technique and knowledge at the same time so its hard to stay engaged. Has anyone found lessons for folks who are technically advanced but theoretically a newbie that worked for them?