What is the best site you've found to get some early testers & product feedback from?

We are building a financial tracking tool where you can customize your tracking metrics in a notion-style doc. https://fina.xyz

I'm looking for the best early spots to post the software in groups that are likely to have some early adopters.

Things like alternativeto, indiehackers, reddit, Hackernews, slack and discord groups, LI, Facebook, Twitter, etc.

I'm just curious if anyone else has specific ideas or groups that have seemed to work really well for some early traffic.

Thanks so much!!
Clay