That’s the point. Unless your tires are overinflated or rock hard, you probably don’t have any viable options unless you can throw thousands (and thousands) of dollars at it.
Again, cars aren’t computers. I just ripped the guts out of my Thermaltake case and built a new gaming rig in it for less than $1,000. That’s not something you can do with cars. I mean, you can, but it’s gonna cost you eye-watering amounts of money. There’s a car customizer near my house who could do it. He strips cars down to the bare chassis and then meticulously builds them from the ground up to be whatever the owners want them to be. His projects start at around 100 grand.
Air suspensions can be more than 3 grand just for the parts. Then you have to pay someone to install it. And even then most aftermarket air suspensions these days are designed to allow you to lower the car on command to make it look “good” (subject to interpretation) at car shows or to keep the vehicle level when you put a lot of weight in the back (which is why freight trucks and motor homes often have airbag rear suspensions).
So you need to get the right kind of air suspension, preferably adjustable on the fly. And once you’re done, you still have the same chassis which was designed for economy and handling over ride comfort, and there’s no making that better without another large investment.
I suspect that you might be on this air suspension thing because some luxury cars come with it. Yeah, they do, but they also have well-paid chassis and suspension engineers going through a squillion research dollars to set the vehicle up for the best ride from the get-go. You’re not going to get those results by going to Al’s House of Customz unless you’re willing to give Al a ton of money.
Usually when you’re talking about modifications that radically change an aspect of a car’s performance, whether that be making it significantly faster than stock, or ride significantly better than stock, it’s much more economical to sell the car and replace it with one that’s closer to what you want.