The output of even some of the very best songwriters is about 90% mediocrity....

For most people, the best way to go is to perform a balance of traditional material and/or covers along with a few of your own better songs...if you must.

Generally, most fair minded audiences won't mind an artist "trying out" one or two new songs during the evening and, if they are good, they will catch on in due course and become an accepted part of the folk/singers/performers repertoire.

Unless you are a really talented writer, very few listeners want to suffer a whole evening comprising songs "wot you wrote yourself". There's only so much shecht most of us can take at a time.