I was stuck on 25 fir what seemed like forever. I just nailed the vanguard strikes and bounties, then bought legendary armour. Dropped a few legendary weapons during gameplay and before you know it im on the way to 28. It will all come at once as long as you complete a variety of things. Dont get stuck doing the same thing all the time, not only will it slow you down levelling, it will start to get boring 😉

I'd gladly help you if you have X360 I'm lvl 29 and had some trouble a few weeks ago with leveling. I had to grind out a queens helmet yet to get a Ghost Angel helmet just 2 days ago.

What you need to do is start by levelling up your chosen provider. Are you more of a PvE or PvP. Vanguard or crucible. Next, start collection some marks, either by striking continuously, or Pvping over and over. Either can be avoided by bounties or exchanging. You can also buy armour from your provider for specific marks and prices. After you've collected some marks, you should have a fair bit of strange coins, maybe an exotic weapon or two and possibly some armour (not for your class :3), if you done have exotic armour, you should buy some from xur when he comes next. Since you can only wear one piece, repeat the marks and striking until you reach roughly 26-27. After you have reached that, time to start raiding. Raid armour is exotic armour but is just purple... the only difference. Bear in mind, if you plan to receive to helmet, you will have to complete the raid on hard mode, hoping you will help it. From then, just roll with it, level up your armour, do bounties for fast exp and so on. Gg