Some of quests make sense being repeatable, if with a slight change of wording: getting stock for Maltz, wyvern's eggs, lizards eggs, etc. are things you can do over and over again. But some are ridiculous: finding a ###th bracelet (or key) - anything that has a sense of Groundhog's day should by all means be one-time only. And more quests needs to be added of the kind you can do repeatably (not weekly!) as an alternative to grinding and a reason to party. Right now partying for many characters are OOC and immersion breaking, if you are not hard-core dungeon-looting adventurer or a slaughtering maniac. You all know what I mean, you realy do.
Let there be more scripted little things you can do without DM present, but which give characters ways to do ther work: like going for crafting supplies into safe and dangerous areas, performing services for people (healing, patroling, performind literaly, etc.), researching stuff, whatever. Like, we have a crafting bench which turns beetle shells into gold or cheap potions. It's very niche right now. And you can sacrifice a gibberling heart to Malar for XP (even if you're Good) - again, very niche. You can farm hearts, but Grinding will give you moar XP, so no point in doing it (even if it wasn't against the Rules to farm XP).
The manner, in which characters can get XP is one that defines a lot on how the game is played. If we didn't need XP no one would grind for XP - a simple logic. We need XP to play the game, because you need XP to become as powerful a character as you with to have those abilities you wish. Including social skills...
RP XP has a cap - why? Fishing RP has a cap - why? Grinding XP has no cap - it's fine. If it had, well, what to do then?
Have a PC, which is a trader - a crafter, a performer, etc? Go adventuring anyway, instead of spending most of your time at your trade. For a meager XP, yes - like we have from fishing - but being IC and reaping your rewards, which is better than making up a reason to join a slaughterfest in some woods. RP XP system we have now is a joke and a bad one.
I played on one server, which had it's falacies and I don't play there anymore, but it had realy decent RP XP, which netted more than monsters and was on par with quests. Quests were mostly unrepeatable, but there were LOTS of them, for all levels. What killed that server is that it was imposible to solo, while it being a lore heavy setting of Middle Earth, AND administrators being d-bags. Imagine, 1-6 people in a world you can't solo (or powerbuild, gish, at all!) grind or quest or even survive as a low lvl with virtualy no DM presence. But since there was a strong (not perfect) crafting system, which gave solid XP, had a great RP script that would realy award RPing, always more quests to do, if you're not going for crafting supplies - which alone was a major stapple for Partying and RP - those 1-6 people could have a fun time playing. I say this, because the "success" of that server was not an achievement of admins, but the way system was set up, and that some people have built the world for them in which you can go different places and pursue your trade, while having a meaningfull interactions with other playes. I realy disdain a "RP" of standing and yacking all day long, but hey - someone disdains Grinding all day long! But grinders can get their XP, while people RPing anything other than looting and grinding maniac cannot after a cap is reached.
I won't be for limiting monster xp, I'd rather have RP and "crafting" (Fishing) cap removed or expanded... Caping those make no sense. They are naturaly "capped" by time you can spend at those activities.
Right now we have a strong Powerbuilding community. Makes sense, since building for XP gain and Lootz from monsters is way to go. And then we have dedicated RPes. But we don't have RPing majority and Grinding\Looting minority.
What Social RP we can have on the server, for example? Can you RP being a merchant and not deal in the same Lootz from dungeons? A crafter? A sage even, a researcher? No.
I don't mean we need to add all these things, but the reality is such - PCs are adventurers and looters first. Exceptions only prove this. So, at least for those kinds of quests, they better be less... maddening. Like, you know, "Hello, Lady Adora, how is you bracelet today, stolen? Oh, I've returned it 6 days ago, see you tomorrow!"

I put on my robe and a wizard hat...