You have to weigh how much you like the people you intetact with every day vs your desire for more rewards/growth. That you’re asking means you definitely want more in return for your time & effort. But is it worth it to you to find a new group of friends? Not that you have to stop associating with your current ones once you switch guilds. It may take a couple tries to find the atmosphere and productivity that meet your needs, but nothing wrong with that.
My only suggestion is talk with your leadership before you decide. Let them know what’s on your mind. If you’re their biggest contributor and they’ve wanted to change things but didn’t know how to, it may light the fire under them to do so. If they’re happy with how the guild is, then the respectful thing to do is give them the heads up you’re looking for a higher level guild so they aren’t surprised to just find you gone one day. And try to finish out the week if possible - especially if it’s a GW week. Don’t leave in the middle of a GW week. If you really like the group you’re with, there’s nothing wrong with moving on to bigger & better things. But do right by them any way you can.