Choose how much warmth you want.
A yellow beige reads warmer beside terracotta and more contrasting beside a muted blue. Compare both beside your fabric. Pink beige may suit a different warm white than a sandy upholstery.
Add texture before adding more colors.
A natural rug and curtains with visible texture can add variety within a small palette. Start with the existing surfaces and add only what you actually want to change.
Screen colors are a guide. Test physical samples in your home.
Keep exploring
What paint colors work with a gray couch?
Warm paint colors for your living room
Paint colors for a low-light living room
How to match rugs and wall colors
How to match curtains and wall colors