Writing trip reports, adding photo's, anything positive added to the boards. Or getting ERT on El Toro could also help a lot with Karma . Me, I basically begged for my first +1 Karma. - Karma could result in flaming others, bad conduct rediculious threads and so on.
Best bet is to keep posting, and if someone finds a particular post good you're Karma could change !
It's really not that big of deal, it's just an added fun feature on the board.