You obviously have different needs than what Beeper provides, but claiming it's better when you only support a fraction of the networks is a bit steep imo.
Curious what other networks you plan to support and what are your monetization plans?
I really like the addition of folders and CRM features compared to Beeper.
The networks I'm interested in are Telegram (you already got that), Signal, Instagram, Matrix, Threema, Slack and Teams (in that order).