a question for always solo player

[Ntol]

another reason of me to go solo...

I´ve both joined parties that were much higher level than me and accepted lower levels into mine when I was higher, and not a single time I thought the lower level was a hindrance. Sure, it will be harder to get gold if someone isn´t contributing as much to the damage needed, but getting gold isn´t that hard to begin with. Some kind people will even taxi you with two seater mounts to the NM.
Also, since your elemental level isn´t dependant on the job you are currently using, try using a healer when you join a higher level party, since your heals won´t be affected by your level and you can raise fallen party members, which is always useful.