@Monsterlittle a contrived workaround can be to use the discount system with has some configurations that let you limit the discount use to 1 per customer like the BUY X GET Y.
For a BUY X GET Y approach this means you need some two product contrivance and customers need to know to add both products to the cart.
Or with a % off you need to raise the price of the product so high that the discount has to be used, or find a tutorials that auto adds a manual discount code to a users cart.
There are also some maximum quantity tutorials but it varies by which theme you have and your skill level with code.
If your product is sensitive use the apps available as you need to not just limit purchasable amounts on the website but also make sure invalid orders don’t get fulfilled if they get through the frontend.
For just a frontend theme customization that restricts add to cart quantities you can contact me at paull.newton+shopifyforums@gmail.com with store url and use case details and budget.