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Almost all countries need to reduce their population.
On the contrary, actually, we need to increase our populations. Assuming that you mean an equal reduction in all demographics, the existence of productive, and hyper-productive people is mostly a game of statistics. A larger population means that more of such people will exist. Such individuals are necessary for pushing humanity forward. A nation with a larger population means a larger natural defence. A larger gloabal population decreases the chances of a mass-extinction event.
it’s stressing the system.
What specific stresses are you referring to? We have no lacking in resources, nor space. Economic activity is proportional to those acting within it.
This isn’t necessarily about the sheer size of population, and has more to do with birth rates, but this Kurzgesagt video also outlines well the need for a higher birth rate.