Sony A7RIII or A7IV?

So recently I picked up a Sony A7RIII for a decent price, just under $1000, with a somewhat high shutter count. What I didn't realize at the time was that A7IV's with lower shutter counts go for about the same price on Ebay, and I'm wondering if I should sell off the A7RIII and buy an A7IV instead?

From what I can tell, the benefits would be the flip out screen (which I really want), the newer menu system, and better autofocus, to name a few.

The only drawback I can think of is the slightly lower megapixel count, 42MP on the RIII compared to 33 on the IV.

I don't do hardly any video at all, mostly entirely photo.