Upgrade options from i5-7600/GTX 1060 6GB

[pinkie_]

I'm looking at my upgrade options here and would like some advise on what I can upgrade to. The goal is to have a PC ready to play cyberpunk comfortably and games at 1080p 144fps

• CPU: i5-7600
• GPU: GTX 1060 6GB OC
• RAM: 8GB 2133mhz
• Motherboard: Prime B250 Plus

The motherboard also has 2 non-functioning RAM slots so I can't upgrade RAM at the moment. Any advice on which part I should upgrade first? I have been looking at the ryzen 2600 with a new motherboard and another 8GB of RAM first, but would like some more opinions.

 

[pinkie_]

Around £500 currently

 

[pinkie_]

Considering my current motherboard only supports 2400mhz RAM and the 1 and 2 RAM slots don't seem to work, I can't run it dual channel. Do you think it would be wiser to perhaps get a motherboard too? However in that case, i'm not sure whether to go Ryzen instead of the GPU, or wait until I have enough for both