1) Mind the MV score. There's some things that will have a permanent impact, such as a complete profile, adding your Twitter, offering Skype, customs, Fund Me, phone sex, x-amount of photos, x-amount of videos and a couple other algorithm signals. Outside of that, there's criteria that is used from the past 60 days(?) (pretty sure it's 60, maybe 90, would have to check) such as number of hearts, number of reviews, number of new videos and store items, ect.
2) Compete in the competitions. I can tell you there's a 3-model photo contest going on right now. If you can signup two other girls you know in your area, you can all compete. MV usually offers (might be always) a revshare on the money earned from the votes you receive, plus you'll be featured on the contest page. Free money and free publicity.
3) It's all about the content. More content = more chance for discovery and sales. Whether you want to try dominating a fetish or diversifying the type of content you offer is completely up to you and there's advantages to going either route. Producing higher quality content will also help. Whether this means shooting in higher resolution, more dilligence in editing, better lighting, so on.
4) Outside promotion never hurts. Shame their affiliate program is only for model referral or I'd say you could make some extra bucks this way as well.