No, not me anyways. I did note that OP has only been in the game for 5 months – I know how much of a struggle it is. But my intent was to let them know that climbing up and taking down higher titans eventually settles the dry spell of materials, not to tell them to switch alliances or anything like that - my apologies if that was taken off base, and I should’ve made thay clearer.
Personally I started with an alliance taking down 8* titans, and those were pretty brutal for me back then. But I didn’t even know what those materials were for. I had no heroes to use them on when I got the mats anyways.
My first alliance was wise enough to instruct me on leveling up 3*s first until I had a wide bench. That was very helpful advice and let me build up teams to clear those rare quests consistently.
We lost a few members, went down to 7*s, and in about 10 months we climbed our way up to taking down 9*s consistently as more players came and the younger players developed their rosters. It won’t be the same for everyone but my first alliance really helped with guiding me through the things the game doesn’t tell you.
10*s are what I recommend, but 9*s give 3 drops of ascension materials for C rank and up. 3 rolls is ideally what you want to hit at least so your chances of getting rare mats increases.