yes pics are made to use 1920x1680, but My monitor can not use 1920Scaling pixel art down to any ratio is going to destroy the art unless you use aliasing (but this will increase your colors and not be pixel precise anymore).
The only way to minimise the damage is to scale it by a factor, but even then you will probably have to re-draw details back in again.
Try to make the artwork the correct scale from the start Jether.