Just remember that Lex has to be close to you in order to maximize his damage output, so poke from long - mid in order to have the best chance against him, because your daggers don't have a damage fall off (´・ω・`)
Ash aint safe from your ult during hers, so if you see an Ash ulting on the point for the sake of touching, use your ult to prevent the team from regrouping fast and deny any potential pushes.
Maeve has a particularly harder time than most champions with aiming, as her weapons have drastic gravity drop, and have projectile speed, which means moving around unpredictably will make yourself harder to kill.