I understand completely how you feel. I started playing again back during the middle of Black Armory. Spent the rest of Forge Season getting up to speed. Thankfully, Joker's Wild focused on Gambit (not a fan) so I grinded for PvP pinnacles. I obtained Luna and Recluse right before Revelry took hold. I finished my Mountaintop triumph grind all within the last week we had of Mayhem. It's an EXTREMELY long and unforgiving grind. But by far the best way for getting medals and doubles is tether spam. Especially in the small maps. Just pop a tether and wait. Damage is shared between all tethered opponents, so one grenade will kill all of them if your aim is on point. And it counts towards your double kills. Just play smart and you'll get it. I still have to reach Fabled again because unfortunately I finished just after reset. The quest is doable. I can attest to that personally. But you'll never hear me speak highly of the Mountaintop quest lol