Level Up Vanguard Reps
While you can level up all vendors, they tend to have a very strict cap on the legendary gear they give you (usually five points less than your current light level). However, Ikora Rey and Commander Zavala tend to be a bit more lenient with their packages. Especially Zavalla.
If you have the time, run through some Vanguard Strike Playlist and collect as many Vanguard Tactician Tokens as you can. You can then turn these into Zavala in exchange for a gift. More often than not he’ll give you two items, one that follows the cap, and one that’s higher thanks to a legendary mod. Use that new item, or infuse it into something else, to steadily increase your Power in Destiny 2. If you really want to push it higher, farm Nightfall. While you can only get the Powerful Gear reward once, the drops within still have chance to be better than your typical strike.
For Ikora, complete any random Milestones you get from her (you get a new Milestone daily, though not always from the same vendor). Also, each week make sure to complete her Meditations for some Tokens. Turn them in for some rewards.