What is next after level 100?

I think first bosses start at around 10x, but they aren't easy. You can try some Headless Horseman, Bigfoot, Ravana, Papulatus.

CWKPQ is a lv. 90 party quest with lv. 130 bosses, iirc. Most people start doing at 140+, with 4th job skills max'ed, depending on each job. And it isn't a common 5~15 minutes party quest, it's more like a boss. It's much harder, but at same time more rewarding (that's why you can only do twice/day). After lv. 100, this and APQ will be all you have in terms of PQs. MoN is a lv. 110 pendant that you can get from CWKPQ at this level if you want, probably gonna need help of your friends or buy the service for something aroung 15m.

I don't know many high level quests (except skill quests and bosses prequests). I think most people at 100~120+ just boss or grind on mobs, tbh.

 

level 101

 

Damn, you stole my joke

 

You will still do things in party, but more boss expeditions and it depends on job 7f, or 5-6

 

HPQ is till lvl 200

 

Yea you're going to the "wall" after MPQ where if you are used to getting exp from PQs (PPQ is bad for exp at that level). Many experienced players leech all through 3rd job, but if you don't want to do that or don't have the mesos to burn, you will have to grind. Quests are few and far between and won't give you much exp either at that level. If grinding for the sake of grinding is too boring, come up with some other goal to accomplish while you're doing it, like the Monster Book