Honestly man, You don't need Davinvi Resolve. That's a bit over the top for for film grading in my opinion. You can just do a simple Adobe CC subscription for a few bux a month, and learn how to use the Curve, Levels, and Exposure tool to get similar results.
There are also great Color Grading plugins for After Effects such as Red Giant's "Mojo" and "Looks" (If you know how to use Instagram, you can use Looks).