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Welcome. It seems you've made a good start. Other simple things you can do which are cheap and easy to reverse would include inflating the tires. You'll have to decide for yourself what is safe and feels good. But your tires can take a lot more pressure then we generally put into them. Mine for example pumped up to about 58 or 60 PSI, even though the max sidewall pressure is something like 45. And I've done that for nearly a decade straight without incident or difficulty.
Since you're mechanically inclined and interested, you might consider engine modifications, such as deleting the power steering belt. Others of the accessories you might also delete or switch to Electric Drive. Air conditioning for example could become electrically driven if you had the time and patience to design and build the system, or transplant one from another Toyota vehicle.
There's also a variety of aerodynamic modifications you could implement that are low-key and would not radically change the overall appearance of your car.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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