I just listened to the entire quartet, having not been on this site much during the past two months.
I enjoyed your work, and as string quartets often leave me dissatisfied, this was no exception. You have written a lot of music in the past 6 months or so. Most of it is listenable and enjoyable. We all (living composers) have a tremendous weight on our shoulders. That weight is the burden of comparison with 250 years of outstanding composers. I struggle with this issue myself, constantly. What do I have to offer that will really contribute anything to the classical repertoire?
Ultimately, we just have to compose what we ourselves want to hear. And if that makes us famous, or if we just slave away in obscurity, that is still all we can do. If you find no joy in it, it is probably best to do something else.
I went through my own crises of confidence recently. But being 65 years old and retired, I suppose I will just keep trying.
Anyway, it is a nice piece, and you can be proud of it.
Paul