I think, that’s the biggest problem.
What are you killing, 2*, 3* titans? You won’t get good loot from those.
Try to find an active alliance, best killing 9* or if they are to big for you and you don’t have fun at least 5*+
There you will get your mats much faster even if you’re always last on the Titan.
And also you need mats for 4* or 5* heroes. Have you already leveled some good 3* teams? If not you can look here for some inspiration about the best 3* heroes
Or if you don’t have any of those, you can also post your 3* rooster and get some information who is useful and who not so.
Edit:
Found your rooster, seems you already have a lot of 3* ready and also some 4/5*.
Then I would only recommend killing bigger titans, fastest way for more mats. (and of course do all the rest, filling chests, doing events and tournaments…)
Good luck with your further improvement
