Define low rate cuz low rate for a brazilero that means x20...
Also define solo cuz when i solo i mean im having my main and 2-3 alt buffers running behind...
That beeing said,assuming you try a x2-x7 completely alone with no friends/alts,i would say that there is really no class that can solo for ever...At some point you will be ''forced'' to join a group if you ever want to move on in terms of gear/exp/drops.Unless you 're a pro botter and you can raise your very own Korean Rice Farm(which will be stupid cuz very few servers deserve such devotion!)...A good class that can solo for some time with no real need of others is EE.But still you 'll need to find a group later on as any other class... :)