Upgrade Options

Hey guys, I'm thinking to upgrade my build a little bit. My budget is around £100 ($125).

Here is my current build:

CPU: Intel i5-6600

Motherboard: Gigabyte z170 hd3p

RAM: Corsair Vengeance ddr4 3000 (2*8gb)

ROM: Sumsang evo 750 ssd

GPU: Powercolor RX580

BT+Wifi: Fenvi t919

Monitor: Samsung E28E590D 4k

Keyboard: Logitech k780

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Here is the benchmark:

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https://i.redd.it/bawvtqt0m9c31.png

This build works perfectly. But I still wanna upgrade it. Here are my current plans:

1. upgrade higher speed ssd
2. upgrade CPU (if possible also upgrade the motherboard)
3. upgrade to magic keyboard (logitech k780 feels not good...)
4. Others ...

Guys, what do you think? Thanks!