Events can be a good way to connect with other people in the same boat. I think being granular about sorts of coaching you're looking for, can be useful.

I'll echo others who've said doing a lot of reading on the topics you want to level up on, is a good way to "mentor yourself" because one of the things you might find, is a lot of people who "mentor" might not be as great at it.

People we admire don't always have the skills for coaching, etc., but I've found the best advice I've received as an independent has come from relationships I've made through various communities I've become part of. Twitter and other tools can help, but it's also often a slog.

Kippt has been great for me this year. There's an iPhone tool you can buy too that'll let you keep tabs on your links too and there are multiple lists you can share. My biggun is wanting to share what I link in an easy way for people who might not be as savvy and it's been nice for that.

Also using Pocket, though not as much of late.