Joining a guild
You can browse this forum:
https://forum-en.gw2archive.eu/forum/community/lookingfor
Also meeting people in game often opens opportunities. Then of course there are the guilds that spam map chat. I don’t recommend them though as they are usually just looking for numbers.
The Burninator
You can also join more than one to try them out. Once in, pick the guild then “represent”.
Remember to advertize your time-zone as well! You don’t want to join a guild that’s 12 hours apart, as good as it may seem. 
EU The Right Trolls ~JiVE~
Someone incredibly intelligent, pretty and humble (and pretty) <.< >.> wrote a post that might help you find a guild that’s a good fit for you.
Did I mention Pretty?
Relentless Inquisition [PAIN] – FA