You can do this easily in Lumetri, no need for a Resolve round trip; mask off the area you want to isolate (in this case your chest, I’m assuming?). If you move around a lot, you may need to track it–in the Effects control panel, you can draw the mask, and then use the little transport buttons that look kind of like: <| < > |> (they’re right next to the Mask Path) to track forward or backward.
You won’t want to just crank up saturation, because that’ll make the whole mask area look different than the rest of the shot; I’d use the secondary color correction controls down toward the bottom of the Lumetri panel. Basically, this allows you to do a chroma key of the color you want to affect, then lets you apply an effect to only that keyed area. In this case, that’s the orange-y red on your shirt, yeah?
Get that color dialed in to the Key section, then use the Correction section to add back in the more saturated red color to the area you’re keying out.
In general, it looks like you’ve applied a somewhat desaturated treatment to this shot setup, so you may want to revisit that look–more saturated and contrasty in general will probably make the logo look more poppy, as well. Also, if the shirt itself doesn’t have a good printed ink color to start with, well…then it’s time to have your boss go have a talk with your screen print shop, no?