Getting beta testers: What works and what doesn't?

Hello IndieHackers,

We've recently launched Wiseone: a new AI-powered chrome extension that enriches the news reading experience by saving time and better analyzing & understanding online information. We are now in the process of getting Beta testers.

I am interested in hearing about your experiences getting beta testers and your suggestions for best practices.

Here's what I have tried so far:

1. Polywork (works super well)
2. LinkedIn (not bad)
3. Twitter (trying to find ways to make it work)
4. Reddit (banned everytime for self promotion)
5. Free listing websites (meh, not so much)

We've had promising results with these methods (about 200 sign ups, 100 logins and up to 10 active daily users).

I would love to hear about what has worked for you and what hasn't.
Specifically: what platforms and strategies have you used to successfully gather first active users?
And how do you manage their feedback and ensure they stick around to become early adopters?

Looking forward to hearing your insights and suggestions.

Cheers

Ps: Here's wiseone for reference: https://bit.ly/3XiaY5w