Hey Pablo, thanks for reaching out! Appears to be a question for the community so I'll let others answer but also share my perspective if it helps. Feel free to post in other channels such as tutorials and inspiration or community general.
Personally, I do prefer to broaden the search since data online tends to not be very standardized across platforms and data providers. This means that companies may post job positions with different or similar titles but the position itself is very similar overall, thus casting a wider net could help in certain contexts. If there are very specific niches where positions are unlikely to vary as much, then it could mean the TAM is very limited as well and easier to exhaust rather quickly.
Finding ways on how to make the solution relevant to similar and somewhat overlapping niches, if possible, could help. Of course, this is quite high-level but hoping it helps a bit, and others can share their thoughts!
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