Armor in D2 is important for all players, no matter what your level is. It provides your character with strength and additional abilities that can often improve your chances of winning a fight and overcoming different obstacles faster. And if you make sure that Destiny 2 Artifact Level is high enough, your armor will help you become even more powerful. Here are a few examples of armor you should consider obtaining:
Destiny 2 Omnioculus
Scatterhorn
Reverie Dawn
Daito Foundary
…as well as many others. There are tons of amazing armor sets available in the game, so grabbing at least a few of these is worth a try!