Easiest and cheapest would be the 2 part epoxy you can get at the big box stores. It would look “ok” but not fix any pitting. It does not hold up well under hot tires, but is fine for normal wear.
You can go with: epoxy with stones, like diy nature stone; diamond grind and acid etch; rubber mats; plastic garage floor tiles; or porcelain tile over thinset. These would all be fine to park on again in the future.
If I was using the space as living space only, I would probably just use LVT right over the floor and be done with it. If I wanted something awesome and future cars, better against oil stains, etc, I would probably go with tile.
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