What should I upgrade first and what to?

[jakey1995abc]

My specs are the following:
Asus GTX 770 OC edition 2gb DDR5 (with 1 failing fan)
AMD FX 8350 @ 4ghz (unable to OC due to mobo)
Asus M5a97 r2.0 (can barely run my current CPU)
4x8GB DDR3 ram @ 1866mhz
512gb SSD with OS
2tb WD black
1 1080p monitor

Any help is greatly appreciated and I would also like to add, that my current max budget for upgrading is £300, so UK prices please.

 

[jakey1995abc]

Personally if it was me I'd go DDR4 and go Ryzen with some fast RAM 16gb... What's your PSU model and age?

psu was recently upgraded a few months back, evga 750gq