Upgrade help from 9yr membrane to HE/TMR for CS2 (Faceit L9 / ESEA)

I am currently playing for the last 9 years on a dying membrane keyboard and want to upgrade to something like a TMR or HE keyboard because I feel like it may actually make a difference here.

I am currently Faceit Level 9 and taking the next ESEA season seriously. I play entry/star rifler so counter strafing and instant stops are my priority.

I want a valued upgrade with rapid trigger. I am not just looking for mechanical keys. I want the specific performance boost for CS2 movement.

Budget preferred up to around £130, can stretch to £150 if necessary. Chinese boards are fine.

DIY or prebuilt, im open to both. I have some experience with friends doing custom builds and basic modding.

I want anything bigger than a 60%. I seriously hate the way how small they are and I find the extra keys useful.

My membrane keyboard is quite low profile and its just what im used to, so I dont really want anything that feels like im typing on a brick.

Im located in the UK, so I dont want to pay any crazy prices.

Ive been looking at boards like the Monsgeek m1 v5 TMR or Irok MG75 Pro.

I have minimal knowledge so I might say something wrong here. Correct me please if I do say something that is not factual.

Can someone also tell me where would be the best place to buy the keyboard too? Link, which marketplace or website would be nice.

Thanks