I'll chime in, since I've encountered a similar philosophical crisis recently.
I'm a fairly reserved person that would never be accused of being flamboyant (in the literal, non-connotative sense). I wear a lot of gray, and like to say my wardrobe is as colorful as my personality. I didn't live through the 70s, and have never grown an appreciation for that color palette. With the limited interior work I've done on the Glenbrook, I've introduced more grays to substitute some of the damaged blue stuff that has come out. This seemed like the appropriate millennial thing to do.
When I bought our Palm Beach, it ended up having a lot of beige, but with a bright accent color--something between teal and robin's egg blue (I'm no expert). My knee-jerk reaction was, "wow, that's way too loud for me".
I must say, I've really grown to like it. The wife has too. We've leaned into the theme, and have added more matching accents here and there, including some of the random objects stored within the coach. Other people really like it too, and we get positive comments on it all the time. So I say, give it a go!
Your interior currently looks really amazing. Calm, soothing, clean, tidy, well-crafted...but with maybe just a dash of dentist's waiting room vibe. It looks like a perfect canvas to start adding a little color to. An accent color might go really well with what you have already. It doesn't have to be a lot, and I don't think it'll really make it feel smaller.