The tile is not very MCM. What about Terrazzo floors with a touch of pink?

You should post a floor plan and inspo pics.

WHAT is it you want from us ??? I see abunch of ideas done in a mess , you have clutter becuase you hvae too much stuff you have no plan as to how the whole space has to work together so declutter big time remove all that stuff off the walls MCM is allbout simple good design not a bunch of stuff all over. I love MCM and when done right is awesome Check out MCM spaces on line to get a good feel for that style. Are planning on keeping the pink kitchen ? If so then IMO all appliances need to be white or stainless or refurbish the originals, to let the cabinets be the star. If you want to use the red then you need new cabinets IMHO. SO if you want help here we need to see the spaces empty except for the things you want to keep for sure .I agree all one flooring everywhere will aslo keep it simple Color for sure is part of MCM vibe but used properly and in small doses of pattern and color. This is my rrdone MCM kitchen the original was too small for my catering biz but my home is a 1956 MCM ranch so tried to honor it as much as possible while realizing it needed to function in the 21st century.And my LR this is just an example of simplicity but IMO not boring.

What I see is no color coherence. In the living room, an area with a white sofa and blue curtains. On the other end, you have a rainbow mural with no color that matches the curtains, a red chair with a pink curtain that goes with nothing. I love the pink kitchen, but I don't think red goes.

I'd start by inventorying the colors and features and deciding what you like. The rainbow mural doesn't strike me as being well-done. My house had a room with a paint scheme designed by a tween and executed by amateurs. The black wall with white molding could be painted in a less dramatic color scheme without destroying it.

Once you know what colors and features you want to keep and what needs to be replaced, you can move forward from there.

To get an idea of what you like best, please post photos of your five favorite objects.

Is this the kind of Las Vegas look you are going for?

https://www.houzz.com/magazine/my-houzz-glamour-wows-in-a-las-vegas-midcentury-home-stsetivw-vs~97399895

I'll start with the kitchen. Since you've just purchased a new red fridge, I did go with red kitchen cabinets that can be complimented with a black/charcoal countertop and chrome knobs and pulls. In your pictures there seemed to be a spot for the fridge on the wall behind the fridge in you picture, and you also seemed to have an adjoining dining area.

For the other areas, is the furniture shown yours? are you planning on keeping anything? It's confusing looking at your pictures are they all from the living room (ex. the ones with the fireplace and the ones with the wall design???). What is on the floor? I see tiles and carpet, do you have plans for replacing any of that?

If you can take your picture straight on each of the walls it would help. Start with that and then we'll take it from there if it's sufficient.