Nothing.
There is nothing you can do with $200. There's almost nothing you can do with $2000 to be honest. You need more like $20k for most projects.
Anything below $20k and your only asset is your time. A few grand will cover a few expenses here and there, but nothing major. If it's monthly money it becomes a bit more useful, since $200-$1k/mo you can at least budget it each month on tools or buying a small amount of advertising.
10 years ago you could take $200, buy some bots, run a method and quadruple your money, but those gold rush days are long gone and the internet is now a place really of full-fledged businesses.