How to solo carry on Qiyana?

I’ve been playing some Qiyana recently, and she’s a ton of fun. I love snowballing on her and absolutely popping off, although I might have a game or two where I horribly feed. My main issue on her is solo carrying.

I feel like if I have a strong teammate like a Belveth or a Khazix I can help both of us get fed and then we can duo carry, however if my teammates int, I might end the game with a very nice KDA but we lose anyway.

Usually between my first serrated dirk and my full item + serrated dirk I feel super strong, but then by the time I’m building something more than my youmuu’s ghostblade, I rapidly start to fall off. The enemy team starts doing crazy damage, I can’t oneshot most of them, and I end up being a threat only to squishies. Usually this is fine if I have teammates, but sometimes they’ll all be inting and I’m not strong enough to carry and get them back in the game.

I’ve heard that transferring into late game Qiyana is really just an Ult bot, which I have no problem with, Ulting and throwing a few Qs, except my team sometimes ints and I don’t have enough damage.

So I’m asking how can I stay decently relevant later on in the game and carry games as Qiyana? My OP.GG is qepowi13 on the NA server if that helps.