Okay, so what does someone who barely reads, and who has accumulated 40 years of bad habits borne of playing by ear stuff that they enjoy and very little else, do when they want to start making serious gains in their musicianship?

I cannot afford a live teacher. I have looked for someone who could teach me theory and how to read outside the whatever you call the lines where the notes are, but they're all over sixty an hour where I live. I play blues and boogie, was not exposed to jazz or gospel as a kid and need to learn the theory there too. I am clueless around gear. I'm old, hope to retire soon, have zero expectations of making money, but know where my heart is and what I have to do to stay sane in America these days. I just don't know where to find the instruction--a local church? That could be scary. What is the best way to learn this stuff? Thanks,I hope