For me I would say the priority is Titans. Titans are by far the most prevalent way of getting ascension materials. In general, it follows something of a cycle:
Raiding is good but really, it doesn’t make much of an impact beyond filling your chest & getting you more/ bonus resources… But one very important thing to learn is that Cups don’t make any difference at all. There is some benefit to being able to open your raid chest in a higher tier but the actual number of cups you maintain isn’t of any real importance.
Challenge Event (COMPLETION), Tournaments & Wars would be my next priorities after titans. Both are good ways of participating in wars & bringing some variation to the game. For both, the depth in 4* heroes is important (3* to some degree also for the events & tournaments).
