rapid vs blitz

I sed to mostly play rapid, and my right was usually significantly higher by at least 200 points. Now as I got more into blitz and the "blitz way of thinking", both of my ratings are starting to slowly match each other.
what is a blitz way of thinking? I need some tools to use when I am low on time in any time control too

Blitz and Rapid and classical are like ice cream with different flavors. And each one requires a different type of thinking. Classical gives you time for long term planning. Because you can think out your moves longer. Blitz gives you little time, so you have to be more practical about your moves. Hence, you would rely on gut instinct and experience for your moves. I never used to like blitz as much because of the more superficial feel for the game. But when you get stronger at your longer time limit games, you will also play better when you play blitz. It's like learning to walk before you can run properly.

I mostly play rapid as I don't like how Blitz can be won or lost based on mere seconds on the clock. I pretty much use Blitz exclusively to train openings now and get pattern recognition, and translate that practice into my Rapid where I try the most
Real chess is over the board classical 90|30.
Online staring at the screen that long strains the eyes, so 15|10 is best.
For fun you can play blitz, preferably 5|3 or 3|2.
Top grandmasters play online 1|0 as they fear engine cheating.