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If the house is self-built, it is likely that the water pressure is insufficient, and if you check the faucet in the neighborhood to see if there is anything blocking it.
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Clogged with limescale. It needs to be disassembled and cleaned.
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Blocked? Either someone else is using water and it affects you.
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The limescale has blocked the rain spill outlet, just clean it up.
The size of the water outlet and the thickness of the water pipe have little effect, and it is related to the size of the water outlet hole inside the faucet. Basically, the aerator is clogged, and it is removed with an open-end wrench and washed down with water. If it still doesn't work. >>>More
Check that the main valve of the water inlet is fully open? >>>More
Go to the home improvement building materials and take a look, they will help you calculate it, both big and small.
Try a new showerhead.
It should be in the supermarket, it's very convenient to wash your ass.