Upgrade the projector or projector screen?

Hello Everyone!
 My Current setup: 
Epson 5030ub + Screen Innovations series 3 - solar white (1.3 gain) 100 inch diagonal.

I sit about 8 feet away from the screen and my HT setup is totally dark with grey walls. 

My goal is to upgrade the picture quality and I want to stay under or around $5k. 

My QUESTION: Should I upgrade to a Stewart Filmscreen StudioTek130 screen OR upgrade my Projector to a JVC DLA x790r or similar? 

What will make the biggest positive impact? 
In today reality, when the techs are getting old too quickly, I would suggest you sell the current one and buy something newer, for example, BenQ MW535A, it's well represented in this overview, but other options are also viable, at your preferences!
The screen is more of a factor if you don’t have light control. Since you do, focus on the projector 📽 and getting one with the right throw distance for your room. 
I got to agree with just getting a whole new one.

I got the BenQ MH535FHD 1080P Home Theater Projector

I believe when I got it, it was like $650, now it's down to $550. I believe this is the site I found it on: https://www.officialtop5review.com/tv-theater-projectors/

For some reason their top recommendation came back not found so I just went with the second one.

Anyways, you can also just look on Amazon and find ones with good reviews that are at a lower price If that's too expensive. Good luck!
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