No cheap programmer would copy your "fixes-fences-in-Boston.com" idea. A lot of local services aren't sold properly on the internet, so if you combine the two you can get something out of your time and labour.

Also local bureaucrats love to "regulate" and automating local compliance is also a good niche. Now with all LLMs around the scope of what is possible has grown, thus the niches where it could be applied have grown too.

Don't drink the VC/YC combinator cool-aid, that you "go big or go home". It's better to own 100% of your comany, than 3% of a VC based startup most of the time. You see outliers like Facebook, Airbnb & etc... but as 37Signals has proved for the majority of startup founders the risk/reward ratio is skewed not in their favor.