Peripherals Mechanical Keyboards

My bits landed today from Amazon, chinese seller but all semmes good. Used the one bit I needed to fix the keyboard.

 

A little advice please - My Steelseries Apex 7 is starting to fail a bit - lovely keyboard but I'm not that fussed about brand loyalty. The D button is sticking and F3 LED have dimmed. What should I replace it with or shall i go about taking it apart? I like the oled display for cpu and gfx temps but not a deal breaker. Feedback would be greatly appreciated!

Can anyone let me know why I should be looking at Ducky or similar? That Yellow one in marketplace looked nice!

 

open it up and attempt a repair, but plan to buy a new one if it goes titsup?