Thus goes the world.
Some countries are wrestling with an
exponential population growth while
other countries are declining in population.

Number of countries are declining in population, in particular Syria, Bosnia & Herzegovina, Latvia, Lithuania and Georgia, all with a growth rate of about minus 1.5%.[8] Other countries with declining population are Japan, Albania, Greece, Bulgaria, Romania, Moldova and Ukraine and to a lesser degree Cuba, Guyana, Spain, Portugal, Estonia, Belarus, Armenia, Hungary, Serbia, Croatia and Montenegro.[8] Many of these countries are in Eastern Europe.

Countries rapidly approaching population declines in the 2020-25 period include Germany and Slovenia.

Russia also faces long-term population decline, although the trend has been stalled through a reversal of stagnant birth rates and improvements in life expectancy.
https://en.m.wikipedia.org/wiki/Population_decline

Over here in Naija population decline no dey our dictionary.

ehis010:
Over here in Naija population decline no dey our dictionary.

So what should i do about it now?

They should add Nigeria to that list. Boko Haram, SARS/POLICE, Fulani herdsmen, Zamfara bandits, Rivers Cultists and hunger are on a collabo to reduce the Nigerian population

Some of the countries listed are deliberate government policies.