Ok, current best leveling techniques that I know of, per KackisHD/my own experience.
You want to focus on a planet. Just not EDZ because this week it's the flashpoint and you want to save that for post 260 because it's one of the few activities that drops 260+.
Just do public events, patrols, treasure chests (or whatever they're called now), materials, and lost sectors on your chosen planet. The goal is to get as many planetary tokens/mats as possible, and level up through your planetary faction packages, as well as just from all the stuff that's gonna drop from those activities.
I was just doing PE's prior. It definitely makes sense to add in easy patrols (the kill all enemies or sometimes, enemy-drops-something ones, and chests, and mats, while you're doing PE's. Buy a bunch of those consumables that shows you chests locations. they actually work well now unlike D1's keen scout etc which was buggy.
Now I'm not as sure on Lost Sectors, simply because I'm not sure they're worth the time to find (with a internet guide). The one I looted so far gave me two blues. Debatable. Maybe they often give legendary's which would change the equation.
Also sometimes the triangle icon "kill certain enemy who drops something" patrols are being pretty annoying to me, in finding that certain enemy. I'm kinda debating if some of those are worth it too. Over simply chasing PE's. I def think the "kill stuff" patrols, mats, and chests while doing PE's are worth it. Oh also, converting the PE's to heroic is always a goal.
You want to save Nightfall, planetary quests, the flashpoint, exotic quests, and any quest that promises "powerful gear" for post 260.
Even following the above it's been a pretty slow grind for me. I'm only 228 so far. Hopefully will speed up once I get a rhythm down.
I'm personally questioning whether it's worth it to me to save the EDZ flashpoint, because I know that planet a lot better. I moved to Nessus so I dont lose the flashpoint, but now there's a learning curve of the PE locations and getting around, etc, slowing me down. Further, it's not looking necessarily to me like I'll be hitting 260+ with much/any time to spare this week anyway, making saving the flashpoint possibly moot.
I dont know how these like, Twitch streamers level so fast. They were worried about post 260 tactics like, yesterday. I guess it probably helps to have crack fireteam. And also it is their job. Still.