lack of heroes is one thing, weak builds is another and to be frank, all four of these champions builds are awful. as mentioned above, the defining piece of the current meta is speed and all of your champions have terrible speed. i can see kael and hellmut aren't even wearing speed boots and lilitu either isn't or has zero speed substats, not to mention almost no speed sets on your champions.
talking of sets, you've made a couple of mistakes with yours. first off, you're trying to hard to get set bonuses. ideally you want to have your champions in matching armour sets, but it's far more important that you get the right stats and good substats on the artifacts. particularly in the early game, you're better off just putting the best artifacts you have on your champions and trying to replace them over time once you have good artifacts from the same set.
second, the sets you've chosen are, shall we say, questionable. to start off with, you've got a lifesteal set on your lilitu. lilitu, whose a2 and a3 don't do any damage and whose a1 deals negligible amounts because she's a healer and support champion, not a damage dealer. you've then capped her off with a perception set, a set whose primary job is to boost accuracy, a stat which lilitu doesn't use. as you can see, not the best choices. moving to your other champions, you've got kael in a destroy set, which is great if you're trying to kill borgoth the scarab king and fairly useless otherwise and hellmut in a toxic set, which is great for absolutely nothing. it's largely considered to be one of the worst armour sets in the game. ninja's savage set isn't bad, but again you're sacrificing the stats you need in order to get the set bonus.
in terms of rebuilding, kael and ninja are both dps champs so you'll want them at 100% crit rate or as close to it as you can get. hellmut will want that as well since his abilities rely on getting crits. crit rate/damage gloves for all of them, atk% chestplates for ninja and kael (hellmut isn't as concerned with damage, so he could use accuracy or hp/def if you want to boost his survivability), speed boots for all of your champions. literally all of them, there are only a handful of niche builds in the entire game that call for any other stat. as i said earlier, it's far more important to have good artifacts than subpar artifacts with a set bonus, but if you are going to try to get bonuses, i'd advise sticking to the two piece sets for now. it's easier to get two decent pieces of gear than four and raw stats will serve you better at the moment than any of the effects from a four piece set. as for your champions, drop either kael or ninja and replace them with an aoe def down champion and ideally find someone with better tm manipulation to replace hellmut.