Yes, only by doing Bounties. Because only people who are level 26 or above can do the Nightfall or the 28 Weekly.
So anyone below that, needs to do bounties only to rank up.
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Don't forget, nightfalls are bumping up to level 30. There's the other kick in the nuts.
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Yeah that sucks for people below level 28. At 28 you could still complete it, or at least be carried.