First Preservation then the usual Vanguard OPs, Crucible, Gambit, Seraphic Shield, First part of Vox Obscura (kill unstoppable and yellow bars before the timer ends), 100K Hero NF is possible but tricky with randoms (longer NF like Glassway and Birthplace Of The Vile are a bit easier to achieve), 250K Normal Dares can be possible but you gotta play the odds and start ASAP until one day you will get a fireteam that kills adds, do objectives first and then kill bosses; Witch Queen Weeklies is also possible, but again, it depends on the Fireteam's goal of wanting the 100K, Iron Banner is good too so pay attention on how to acquire the pinnacle drop or gear. You'll get a mixture of +1's and +2's but you'll advance one level a week. Once your level is advanced take advantage of the Prime Attunements that will give you a pinnacle drop of your current level for defeating difficult opponents. And bounties should be claimed after you advance the pinnacle level. If you can, go lean; equip your gear with the highest current level and don't have unnecessary lower light gear.

Do anything that says pinnacle some of the easiest solo ones are preservation and the playlist activities

Do the pinnacle activities and do the Preservation activity as it gives a +2 piece of gear each week. Sometimes I get a score of 100,000 from the nightfall on hero difficulty and if you run Dares of Eternity enough times and get the 250,000 score for that pinnacle. Learn to do the Dungeon of the week solo for +2 gear...I play mostly solo and it is a lot slower leveling as a solo then with a fire team doing more of the high end game activity.

Google Destiny Optimizer. It will let you the best way to level.