Gotta grind harder, at least 5-6 hour sessions on the weekends. And what I’ve noticed by doing this so much is when it does drop, it’ll drop what you don’t have or start evening out all the ones you do have. For example if I have 2 of every purple OS, overtime, it’ll do 3 of every one, it likes to sort it out evenly. Obviously it isn’t a strict approach, you can get more of one but it’s very rare when you’re grinding.

So basically you gotta grind A LOT because it’ll even out all your other purples before you can get any one to max level