I know this is possibly a nearly forbidden topic to broach in a forum devoted to the idea of retiring early or earlier...
But if you're good at accounting, because you're so young, I think your best investment might be to invest time and money in your skills and credentials and do what it takes to make, oh, say, $20 or $30 more an hour.
As just an example I happen to know a fair amount about, local CPA firms are just dying to find great staff and senior accountants. You'd want a CPA certificate to be in the club, but those jobs would be paying you probably a significant chunk more.
It'll not only be easier to achieve FI if you're making $75K instead of $30K, you might find the years of work to be more interesting.