Have R7-3700x + 3070 - what upgrade for my R7-3800x + R9-390?

[usa all day]

During COVID, I re-built my i7-4790k box when the mobo died.

I bought an ASTEK mobo + R7-3800 & used my memory, HD's & R9-390.

I really wanted a better vid card, but the only BIG step up for me was RTX-3070 - all out of stock in April 2021

I found a PowerSpec G707 w/ RTX-3070 for $1,800 (it's $1,065 now) it's been very solid
~ the case sucks - it only holds two 3.5" HD's
~ I added two 6TB WD BLACK for game & data drives (backup to externals).
~ https://www.microcenter.com/product/630918/powerspec-g707-gaming-pc

I'd like to replace that R9-390 with something better than the 3070.

What are your suggestions?

 

[usa all day]

Based on overwhelming replies, I'll probably buy another 3070 since they are only about $530 now

The price vs % against the 3070-ti ($650) & 3080 ($830) are for my 1920x1080 monitors.

Yeah, I should have mentioned monitor RES & budget in the OP.

Thanks to everyone who replied!

 

[usa all day]

How do I lock the thread since I can't delete it?