Probably staying up too late
Exotics too, if it’s not an Exotic you use often, you can make due with a collections roll. It’s cheap to MW if you’re at the point where you have multiple builds, and weapons are just weapons, if there’s no high kill tracker, you don’t need to worry about pulling (Hawkmoon, DMT, and the craftables non-withstanding).
Shit purples drop like candy too, so infusion fodder’s not an issue.
If you’re into Pokemon, the Pokemon Mystery Dungeon games are fantastic. They aren’t the hardest roguelike in the world (still harder than a mainline Pokemon game though), but they’re fun. The stories are also incredible (can only speak for Rescue Team and Explorers, haven’t played the 3DS titles yet).
Arknights (shout out to my kbin mag !arknights@kbin.social). It’s a fun lil tower defense that you can easily pull out and grind some materials. Keep in mind that it is a gacha game, so there’s definitely aggressive monetization, but it’s definitely on the F2P-friendly side in terms of gacha.
I’m the type of guy who hates New Vegas because it felt awful to shoot things (and that’s why I’m still addicted to Destiny). Aiming’s a bit weird, and shotguns don’t have too much impact, but other than that, it’s not the worst shooter I’ve played. I’ll probably stick with it.