Do you have some method of recording yourself?

I used to use my old reel to reel tape recorder and sit for maybe 20 minutes and sing and play, then listen to what it sounded like. Over the course of a tape there would be definite improvements.

On the down side, some of my guitar accompaniments are rather too ingrained and I now find it almost impossible to play for a song in a different timing or manner, because I don't actually need to think about what and how I am playing. This has taken 40 years, however, and I don't play alone so rarely that it is hardly important.

You do need to practise, but I am sure that being able to hear the results produces a better sound and performance.