Welcome to the site, glad you made it over.

To be honest it's a crap shoot. All of the things listed will help a transmission. Some of the help with performance, but at the same time help with longevity.

All of the above advice is accurate. A cooler would be one of my first additions since heat is one of the biggest killers. A shift kit would help, the servos help, etc. Then again, you might go another 75k with nothing wrong. At the very least I would do a cooler. Maybe accompany that with a deeper pan that will hold more fluid, while the pan is off, might as well replace the filter and do the shift kit, new fluid, etc., and the servo since it's cheap and you're under there.

And that's kind of how it works - one thing leads to another....just depends on your budget, how much you beat on it, etc.