I've been building https://heylangley.com as a solo side project for a little while now. The initial MVP took about 2 months, though I have not had much time to market it. It's pretty much identical to this. I also applied to YC for W23 and was rejected.
Not sure what else to say beyond this: if you have a project that you've been wanting to start, believe in yourself and build it!
Not sure what else to say beyond this: if you have a project that you've been wanting to start, believe in yourself and build it!