How can I replace my front cog... or fix slipping off on folding bike?
If a new chairing is the solution, then the best chainring to solve your issue is a 1× specific narrow-wide chainring. I'm not able to identify your crankset/chainring interface from the Amazon link. Once you know this, you can see if there's such a chainring available or if you'd need to replace your crankset entirely (probably too expensive to be worth doing on this bike).

I would also be tempted to check if you can shorten your chain by one link. This would mean that your rear derailleur would hold the chain on the chainring more tightly.