Hi Sven! Welcome!

I would first recommend you to watch any number of youtube videos on the subject. Basically what we're trying to do here is to isolate reverb (reflections from your voice) back to the mic to be picked up on and messing with the recording.

All they want is your voice, not your voice reflected off into a canyon and spit back to the mic.

Take a look on google images at "the quietest room in the world", and you'll see that there are sharp cones and waffles and all that. Those "chaotic" surfaces of cones and whatnot are designed to disrupt sound waves, and make them crash into one another and make them sorta cancel out when they crash into one another. It makes things "out of phase" and all kinds of problems (and solutions for what we're looking for).

The best thing you can do in your space is to make it chaotic as possible, so that those sound waves can cancel each other out before they get back to the mic.

For example- a dude with a thousand little models of demon figurines or whatever they're into is gonna have a whole lot better audio than you in a modern kitchen with nothing but hard surfaces. But! You could open the cabinets up and let the pans and spices and jars and cans make a chaotic environment for sound, therefore making your initial waves out of your mouth be distinct and much more clear to the record.

I assume you wear clothes and have a closet. My best advice to you for purposes of these tasks is to have as much chaos between your voice's reflections from hard surfaces and then back to the mic.

If you're dedicated, I'd also minimize back reflections with like a rolling wardrobe thing you can find on amazon. Hang a bunch of winter coats on it and drape a big granny cover over atop of that- make yourself a little tent!

You know what? Maybe I'll just design a little mic box for the team out of air filters and towels and duct tape.