After collapse of USSR's centrally planned economy, only a small number of these plants continue to operate.
That's because USSR's production cannot compete with real world.
Even cheapest imported things (like plastic bags and chewing gum ) were almost idolized in Soviet times when people got hands on them.
When Iron curtain fell and imports from west were allowed - suddenly people realized how shitty USSR production was.
And most of factories in Latvia got raw materials from the rest of USSR - after collapse it was not possible/too expensive.
That's why most of USSR time manufacturing died out.

And Hanna - would you like to move to Belarus?

People in Latvia do not - if they emigrate - they go to west.