Just from what it looks like, yes.
Seems you are even missing 3* mats so you can’t ascend your 4* heroes, and if even those are not there lvling 5* makes probably not much sense at the moment.
Finish tyrum both versions, you get a nice cleaner/dispeller.
After that renfeld c, nice Manacontroll hero.
Maybe a second Treevile.
Than merlin at 3.60.
If you have the mats I would probably ascend tibs first.
Lvl pixie, Melia two great heroes.
If you don’t have 3* mats maybe some 3* dupes.
If you have them Max guardian jackal element def down is just so useful.
Than either Li or Gretel. Li better for defense, Gretel better for offense.
After that Kara and drake, both great heroes. Maybe you can even try to bring Kara to 3.70 a little bit earlier, taunt is so a powerful skill, you can probably use it even if it’s not max really often.
Finish Gunnar (and hope for the costume)
After that either you get another good blue 3* or make your 4*.
Kiril definitely before Triton.
Finish brienne, great hero (hope for the costume, I use it even against 14* titans, really good hero)
Gramps is funny.
Berden, mnessus maybe.
After that 4*
Melendor c is just great
Hansel maybe if you want more Manacontroll (you can’t really have to much of those)
Caedmon is a nice dispeller.
Gadeirus c for overheal.
I probably wouldn’t do kashrek and not sure about the bunny, I don’t have the costume but it doesn’t read so good.
And LotL (Lady of the lake) with costume is also one of the 5* you could probably bring on early to 3.70 maybe between lvling the 3* and 4* or after one or 2 maxed 4* heroes.
No idea about the flamingo
After that definitely boldtusk.
Colen (and hope for the cos)
I wouldn’t do rokkamush
After that your 5*
Both Elena c and zagrog are worth mats but you don’t have to hurry with those.
And like always this is just a recommendation, not an absolute Masterplan that must be followed by the letter. Regardless what heroes you choose good luck and happy gaming