Please, note that you cannot delete your Guild, you can join another Guild or create a new one
(but if there are no guild members left, a guild will be dissolved and you can create another one with the same name).
To leave the current the Guild, press the Guild button from the Town view, then open the Finder to search for a new guild or create your own.
Note that you always have to be in a guild - if you'd like to play solo, you can create a guild and set it to Private.
If you are in two minds about finding your new Guild feel free to team up with our amazing players, there are always calls for new Guild members in our Discord: https://discord.gg/XqVdnghcGA
Good luck!