You can get 5 levels easily by going to the basement of the Adventurer's Guild (the building you start in) and fighting a guy there a few times. There's also a guy in the SeaSide farm that will give 1 XP for every time you press a action button within 10 sec. Enemies in the forests close to SeaSide only scale up to level 10 - 15. Also if you can survive the encounters (which would be difficult as a rogue but maybe you get lucky with dodges), demons give much more XP. The easiest spot to get to I think would be the lowest level of the SeaSide mine, definitely go with a full party early. Hope that helps and thanks for letting me know about the discord link.
