The new system of leveling does kind of support groups. Leves going to 99 with getting 4 every 12 hours means people are gonna wanna spam leves. I'd try to get into a linkshell and find some lower level people, with 2 other people you could level all the way to 50 just doing leves.

Once you get to around 35 though you might want to just party with people enjoy the new content they gave us which give us exp chains, if you didn't play xi you may be unfamiliar with chains, but the patch notes explains the xiv version of chains pretty well. That chain leveling will probably be better than anything else.