Well answer is obvious, it's hard af solo especially while not having any people around. But sure, you can wander around, keep pushing yourself even if it will be slow and by the time maybe you will find proper people to play with. I think that later at like 55-60lvl maybe you can even make parties on abg/fom raids, if nobody will take you to their pt and that might grant you an option to level up yourself. About solo, i knew only bishop that was soloing having SE on his back and just farming with Might Of Heaven. Later on, you might even get parties for GC or DI, maybe even eariel for TOI.