I'm a bit selfish so I don't think I'll help the community much/more if when I become a whale.
But when I find something I can help with, I give advice. When I find a good post I upvote (my voting power is limited so I only do that 3-5 times a day). When I find a great curator I delegate but only if I have spare SP or get something out of it.
My main niche is gaming, and really, this platfrom need more gamers that don't only do streams!