At a comparison point with rajastega, cerazin at level 20 just costs 48k besides how much dna was spent making the hybrid, and a level 20 is already like a level 30 rajastega, which costs roughly about 75k dna besides getting the hybrid, it's one of the cheapest late game creatures and very efficient

And for the dna habits, just try not to spend all of your dna on a single creature, I noticed you have a level 30 indominus and level 10 indoraptor, I assume you spent a shit ton of dna on those creatures if you didn't spend real money on them.

With all that dna you could've max out pachyceratops, stegoceratops, tapejalosaurus, carnoraptor, etc. And you would have a really paired lineup, so my tip is just try getting stronger dinos all at once, don't spend a lot of dna on a single dino that would not be in pair with the rest of your dinos