Best way to level beyond R30 is to have a frontal lobotomy. R30-R50 is currently a long, painful, and grinding road whether you are party of solo. It's technically feasible to grind from R30-R50 solo, but I wouldn't say it's advisable, and I probably wouldn't recommend it to anyone (even my worst enemies).
This patch actually forced me to explore other aspects of the game though, and I'm currently having a lot of fun leveling up as a DoL. I'm going to grind out some crafting levels now that I have stockpiled a ton of mats leveling mining, botany and fishing all to rank 10.
I anticipate SE will do something to address the grindiness of leveling post R30. I'd recommend ranking up some other jobs / crafts while waiting for a change from SE, but if you really have your heart set on leveling something beyond 30 right now and you can't even get a duo or trio together, I would try to at least grind on leve's and behest in lieu of a straight grind.
Edited, Dec 6th 2010 12:04pm by thejones