A lot of good advice in this thread. The problem is that such places most likely prohibit self promotion, otherwise they'll be drowning in self-promotion spam (they're already are anyways).
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This is critical. Go where the people who might buy your product are.
Where are they?
You can ask.
* ask google: "where do <X> business users hang out"
* ask potential customers you've talked to (you talked to some prospects before you built, right?)
* ask google again by searching for answers to questions that your audience might ask
The right place for you could be generic social media, forums, slacks, discords, mailing lists, conferences, meetups or something else.
But having focus will help you get the most return for your time.