You say you have tried many programs and countless more, so to be fair and stop folks' wasting their time and yours, you really should list the ones you have tried.
Here's a few that I can think of...
WhatsApp
Telegram
Duo
Signal
Pidgin
Viber
Here's a list of "best" Chat Apps for 2021...
https://www.tomsguide.com/best-picks/best-chat-apps