There is no fast lane for growth. You will not have events by tomorrow or even next week these things take time.

My methods are:

Party finder: have a brief description and somtimes it’ll attract people to join

Player search: this required a hands-on approach and you can be much more selective with your invites, just /tell and make sure they want to join a fc somtimes they have search info that tells them “please don’t invite me”

/shout: go to public areas and shout similar to Party finder, brief distribution and you’ll have a few applicants

Novice Network: Keep a close ear here I don’t recommend advertising your FC here but some new and old players do come here with FC Dissatisfaction or actively seek aid and community

Help your community: Go and help people with ques, compliment others go to HoH Potd, go EX trials. Make connections somtimes it’ll lead to friends ready to sign up

DO NOT random invite it will get you numbers but never a coherent group