Thanks for sharing your specs. I'm surprised that you're using a GTX 1070 for rendering. I have a GTX 1070 8Gb (like you), but I use mine just to play RPGs (like Fallout 4, Dishonoured 2, etc.), and an i5-8400. Since rendering is almost all GPU, you'd certainly benefit from switching to one of those (pricey) GTX 1080s, and later on a second (and perhaps a third). Once your patrons are providing you with the funds to do so, of course. I would certainly not front that expense out of pocket (IOW, from your day job) were I in your shoes, as you have thus far.
BTW, I paid $423.50 for my GTX 1070 on Amazon a couple of months ago. Most expensive piece of the $2000 gaming rig that I built, even more than what I spent on the 1TB m2 SSD I use as a boot & app-hosting drive. Since little of what I do is CPU intensive, I went for the far cheaper i5. I can always drop in an i7 later on if I need to. Your choices to go Ryzen 7 and 32Gb RAM was wise IMO, given that you need a powerful system for rendering.