[JeffreyAK]

I used to do a lot of soloing on electric, blues and metal, not sure about country jams on acoustic but I imagine it's not a lot different. What used to help me the most was playing along with records, trying to match what I heard, and then gradually moving to replacing what I heard with what I wanted to play instead. So every recorded solo becomes an opportunity to improvise. A side benefit is, your own playing is not so distinct, so you can make mistakes and not get hung up on them, though that can be a drawback too (you don't notice how sloppy you are). But I think it was tremendously helpful for my soloing in the electric blues and metal genres.