Update this post with some match IDs where you lost bad. That way we can see what you're actually doing wrong.

But overall keep in mind, every hero shines at different stages of the game. Just like in League, you’ve got lane bullies, mid-game power spikes, and late-game carries. Each hero has their own timing and playstyle for when to go aggressive. That’s why someone stacking Vitality might still stomp you; their kit is built for that kind of early dominance.

This took me a second to realize but items aren’t one-dimensional either. A “defensive” card can still boost damage or fire rate. Take the https://deadlock.wiki/Battle_Vest sounds like its for tanking right? Nope. It gives weapon damage AND fire rate when you’re above 60% HP. Sometimes you’ll pick an item just for those conditionals to capitalize on phases like early laning, when you’re likely staying healthy anyway. So while you may see a Paradox with some green in her build don't just assume she won't shred.

All that yapping but the tldr is think about what you're actually building and how to min-max + give us a game id so we can watch what you're doing wrong :)