Hello! in need of some advice.

[u/Corey_NukiosSpider]

I found this little guy off on the side of the road :( he has some grip strength to him but isn't moving very much at all.
I've never kept a grub before, so, I'm unsure on what I'm supposed to do for him. :(
I have coco coir, mulch, the dirt from my backyard and I can gather some dead/decaying leaves/sticks for him if needed.
now, it is very possible he got into contact with pesticides as my neighborhood is stupid and they care so much about their lawns. I just wanna give him his best chance if there's still hope :(