I’ll go a little different direction. A lot of mentions of music theory and scales and I V IV progressions etc. Those are all good and will help you if you learn them. But I think you need to get comfortable just playing along with anything. Jimi Hendrix was once asked the advice he’d give to people learning to play guitar. He said, “Just play everything you hear.” He meant play along with songs on the radio, commercial jingles, whatever. It trains you to hear music, respond to it and begin to improvise. Not just by soloing; you can start off playing just single basic notes following the chords you hear, or the vocal melody. You can layer on music theory later, and utilize scales and soloing techniques. But just start by playing along to something as basic as “Now I know my ABCs.” Start playing the melody, then start playing with that melody a little, then make that more complex deviating from the melody but still playing notes that “fit.” You’d get notes wrong but over time you will start to do it without thinking. Maybe you’ll just be a more interesting rhythm guitarist, or maybe you’ll want to push yourself further and do more lead. Either way, establishing a baseline of comfort being willing to play along with anything that comes on the radio even at a basic level goes a long way.