[rufusroflpunch]

https://www.nostr.directory

This tool lets you broadcast your pub key on twitter using a specified format, and the app will add you to the directory, and you can use it to find others that have also done that.

Also, if you go to https://snort.social/new, you can enter your twitter handle, and it will find everyone from you're twitter follows that you're not already following and let you sign up to follow them all.