Try listening to some of the stuff that Roy Bailey, Jez Lowe, John Tams, Martyn Windham Reid and other headline acts do. I know a lot of them are accompanied, but quite a lot work a capela too.

Some voices suit different sorts of songs so try them out and see which you are happiest with: for instance, I can't imagine Martyn W-R doing political stuff, his voice was just made for laments and stories, whereas Roy Bailey can do the soft stuff and has a harder edge for the political songs he does.

If you like the song, you will sing it better. There are 9000 odd songs in the DT above, most with music links to them. There has to be one or two there that you like!

Good luck!

LTS