No, OSHA doesn't have the resources to be proactive. I wish it did. How would you prevent it from being gamed? Anyway, employees can be proactive too and that doesn't require OSHA to be proactive -- it requires OSHA to (also) be reactive.
If someone is concerned over workplace safety then they should put their concern into words. Talk with your employer about your concerns. It's easiest if you write down your words anyway, but doing so is required by OSHA: if you aren't satisfied by the solution that your employer offers then you can take the same words to OSHA. It's worth noting that some states (I'm not sure which) have their own implementation of OSHA.
In the USA, any employee can, and should be encouraged to, report [0] unsafe conditions before something bad happens. OSHA has an obligation to investigate if any one of several criteria [1] are true, but one of which is:
> A written, signed complaint by a current employee or employee representative with enough detail to enable OSHA to determine that a violation or danger likely exists that threatens physical harm or that an imminent danger exists;
Your employer will almost certainly want to have resolved your safety concerns. Writing it down when talking to your employer can help with eloquence and finding necessary details. And if you're fired for discussing the concerns with your employer then there's a safety harness for you:
> Federal law entitles you to a safe workplace. Your employer must keep your workplace free of known health and safety hazards. You have the right to speak up about hazards without fear of retaliation.
[0]: https://www.osha.gov/workers/file-complaint