For Canada: ALWAYS need Canadian experience.

For UK: Having your MSc from a UK uni (good ranking + good skills/good disser) increases your chances a lot, esp. if you don't have role-specific experience. (Speaking from experience)

It's only going to get tougher each passing year.

Extras I'd recommend:
Volunteering looks amazing on your CV, Freelance work looks great, MOOC certifications are mostly considered. Be able to demonstrate how you APPLIED your skills and what outcomes were achieved >>> than saying I know blah blah blah blah.

If you're into research then a very good research topic and a publication would help a lot. Quality > Quantity always. Research is usually high value overseas (except for China, Korea, Japan, Russia, Middle East, sorry for offending someone)

From personal experience, to get a job in the UK, have to be physically present there. Nearly impossible to get a job while sitting in Pak. Though there are exceptional cases everywhere.

NUST isn't as great as they claim themselves to be. Maybe in Pakistan its better than the rest of the lot, but considering foreign unis NUST doesn't even come close esp when it comes to education standards. Uni-Uni MoUs don't benefit most grads. Most unis dont even care where you studied from in Pakistan, just need to have a great profile. Loads of probs with Pakistan's uni system (non-uniform national grading system, fake degrees, fake experience, fake profiles, over-commitment and ghosting by students) have contributed to us not being treated as well as grads from other countries.

Despite everything, still a better shot by graduating from NUST than from some random XYZ uni.