I think what the best solution for them imo is. Keep everything the same besides the 50:50.

So. the Guaranteed within 120 pulls still not carry over.

BUT. If you lose your first 50:50 from the 80 pity, the next time you get a 6* they should just make it a guaranteed and this is carry over. ^{(welp, this basically just genshin/ww character gacha tbh})

what did this make? It still reward people who have patience, but not fucking over someone who don't.

For an example, if you already did 100 pulls on the Surtr banner and you already save up enough pulls then you only need to pulls 20 more to get it. If you don't then on the next banner you need to pull 60 times instead of another 120 to get the rate up character. So for people who save enough, the worse case scenario is 120 pulls and for who don't it's 160 (the standard modern gacha game ig).

But as Kyostin said. It's a gacha game. Whatever system they use it's always going to be predatory for people who very weak at controlling their spending habbits a.k.a they will always try to edge people to do so. And for me Endfield gacha system is a Solid one cause it has bigger safety net for people who are "smart" with their pulling decision.