Question What change I do first?

Why do you want to make a change?

Reason: problems, performance, future growth?

Update your post to include full system hardware specs and OS information.

PSU: make, model, wattage, age, condition (original to build, new, used, refurbished)?

Disk drive(s): make, model, capacity, how full?

Attached peripherals?
 
On a pure gaming point of view, unless you also upgrade the GPU you are not going to gain much. The 5700x is way more powerful than the 1600, but your 1660ti will hold you back.
 
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