To Find Telegram Groups, you can search on Google for “Telegram directory”
In Telegram directories, you can find a list of Telegram groups.
One of websites that listed a lot of Telegram groups by categories is: www.telegramdirectory.me
There’s a lot like this directory.
You can find and subscribe to your favorite group by business type and country.
You can register your group in the list of these websites and get a new member.