Pretty color but way too much of it. What color is the ceiling and trim?

I like the color. I would add lots of white or cream. If you want gray, I would only do it in a soft throw and two euro shams as an accent on the bed, depending on the bedding. Look for that before you add other things. Agua/ seafoam colors, even a brown/tan would go with that color.

Tone it down

or spice it up

Before you repaint choose the bedding you will use. If it is a guest room no need to rush. I like the color but I understand if you got more color than you thought.

I love the colour, and I guarantee that it could work wonderfully once the room is properly set up. It needs to be broken up by furniture, art, accessories, trim:

White would also work very well for a crisper look.