Don't make the same mistakes we made our first go around. It is absolutely POSSIBLE to get 280+ with your first playthrough as long as you do the activities in the right order!
Btw, huge shoutout to Kujayhawk47 as he is the one who created this entire Guide. I am merely the man with the camera. You can reach him on Twitch @kujayhawk47
https://www.reddit.com/r/DestinyTheGame/comments/6ywz57/the_road_to_max_power_in_destiny_2/
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Got a guy on my friends list that is 291 Power Level at the moment. He just keeps making new characters as the same class. Equipping all his high stuff on them then completing the Milestones and Exotic Weapon quests over and over again.