It already is everything it can possibly be. Trying to turn an airframe into wonder woman is a big mistake. Eventually one is spending more money than the cost of acquisition of the "step up to" machine. I thought RG on the Skylane was a waste of money and other things. I simply purchased a T206, "gear down and Fixed". If speed and complexity is your thing, the 210 fills the bill. The 152 is a waste of aluminum, as a trainer, it is too cramped, too noisy, and too old. the Skyhawk is a swell trainer,with FI especially. As a Cross Country bird, it sucks. Not enough fuel, speed or Useful Load. Enter the Skylane,etc. Four Fannies, big Fuel, and cargo means 182, 206,or 208. With the Caravan, every box is checked, and I passed on a nice used Grandy for just under a million bucks twenty years ago.
If one's goal is to make a small fortune in aviation, start with a big fortune. It's all money, marbles and chalk.