If I can afford and it’s worth it, I do keep summoning.
Whatever your mind may tell you about signs and omens for good luck or bad luck - in the end this is all random. You may get 3 legendaries in a row, you may get none in 300 pulls. No patterns, no signs, just happens or not.
I only stop summoning if I really can’t get anything useful for me from an event, already have HotM or just hoard my resources for something I’m really after.
Of course, overdoing it is a different topic and I do end up there sometimes. Like I threw everything I gathered for months hunting for Gefjon, got Lady Loki and Freya instead… still kept going until I had nothing left. Should I have stopped after getting Loki? Well, knowing the outcome it’s easy to say so. But this back then was the best chance to get Gefjon, and even if it didn’t happen, in a way it was still rational thing to do if my goal was getting her.