Mark,
I feel your pain. I basically quit a some would call successful acoustic duet because it seemed I was the only one trying to find new gigs and figuring out new cover songs. My buddy had plenty of "free exposure" gigs he found and discount gigs for friends (free food & drinks), but the kids were getting older and I needed at least something in my pocket to justify being away from the family. Then when due to a medical illness I was forced to quit drinking, I didn't mind that my buddy would drink, but he started to get hammered past the point of where he could perform. The first 12 years of the acoustic duet band was great, but I would rather play at Church every Sunday then go back to gigging every weekend and do all the work for practically no money.
As far as flubbing a solo, we have all done it (myself numerous times). But it is my experience most people listen more to the chords, melody & lyrics then the solo. Honestly, I doubt most people noticed.
Keep on playing because, trust me, you will miss gigging in front of an audience..... I know I did.
Best,
John