for the 2007 prius, the RPM and thermostat are changed every few thousand kilometers. In general, for example, what should be changed at 100 thousand kilometers
You should be able to look up a list in your native language in your country for the Prius or it's counterpart in Europe is begins with an A I can't remember the name. And then you will see the recommended change intervals for many of the things on the car. If everything is working well change the oil check the transmission oil and pretty much leave it alone of course keep good tires brake shoes and pads for stopping and there are apps you can get online to manage your high voltage battery at this stage of the game if it's original is 20 years old so get ready. Good luck
what do you mean by rpm? thermostat is not changed unless broken. regular maintenance is mostly oil and filter, tire rotations, inspections of parts, systems and fluid levels. at 100,000 km or probably higher than that, you get into spark plugs and fluid replacements.
