I dont know about Krivis (never tested).
People will die, not because you are not good, but they will try to get heal on the last moment, being always in the front line, so became trapped and then die, sometimes close to where you are, but in dungeons for example, they can resurrect for thenselfs. You can’t be worried about that, players just forgot to stop attack and go heal, even because you need to heal outside the monsters attacking, because if not, the heal will attack monster and will disapear, without heal your friends, (unless you buy the skill to make heal neutral to the monsters so you can throw heal in the middle of monster to help the player with low health), but heal help leveling so people wait before buy that, so the others need to have conscious too.
Priest give you a very good advantage buff on basic punchs and also on magic attacs on the beggining, for example, when you use heal with blessing on a monster, the heal will make even more damage. But I agree you may not use ressuct to much.
The problem with priest is that you always need to do blessing everytime, but that is why is better to play alone, since skills have cadence time to use again, the basic better punchs make you save lots of time. You can be a healer without priest, just grid sometimes and offer heal. The levels 43 to 46 are the worsty for clerics, because without grid or exp cards will be very slow solo, so always try to grid.
I hope someone help you on Krivis, I never was interested on this class, so good luck.