A lot.Lol. What can Pakistan possibly offer if it were to join BRICS? Nothing.
Now let's move along; if it was to join, it's just like the big guys making the little clown feel good.
Pakistan's biggest problem is that its ruling class is sold out. Pakistan, in a way, is occupied territory.
Eventually their grip will break because the pressure is mounting and there is only so much psy-ops and narrative making can do.
When the next general retires and goes abroad as a billionaire, the next in line will have a hotter situation to manage.