Wide mouthed jars are usually perfect. Normal mouthed jars, not so much.
You can add all sorts of things to the mayo, like it spicy try a couple of tablespoons of Sriracha Sauce Huy Fong, it has no sugar. Or add some herbs to give it something special.
Use it as a base for creamy salad dressings.
Only problem is I can eat any of it with just a spoon if I don’t stop myself. Hey, it might be a trigger food for me???