I think one of the easiest and quickest ways for the fandom to get back on track, is simply to encourage everyone to get involved.
For the longest time, I just lurked around. I was content to read all of the fics and headcanons, and to appreciate all of the art. I'd like/reblog, and get on with my life.
It wasn't until I started my own fic that I really started to involve myself in the fandom. I wanted to give back to the community that I've loved, and since I can't even draw a straight line, I did so through my writing. It's not a real popular fic, but that doesn't matter to me. What matters to me is that I gave back to the community.
The past few days, I've made a couple posts and comments about encouraging positivity within the fandom, despite recent events. Trying to get people to realize that the fandom isn't going to crash and burn in a giant flame of infighting.
I think I've kinda gone off point.
What the bedrock of what I'm trying to say, is for everyone to be involved. Tell that artist how much you loved how they colored that one piece, or how it made you smile. Tell that author how that one scene made you curl up in a ball of excitement and squeal. Offer some words of encouragement to that one favorite mutual that seems to be having a rough day. Share your headcanons. Try your hand at writing a fic. Try your hand at drawing some fanart.
Despite what a few anon assholes may have you believe, most of us in the fandom are pretty awesome people.
Be involved. Make your voice heard.
But, be respectful when you do it.