Selling/Buying Advice Montana Billings

We have a house in Billings that we bought in 2020 for 285K and currently owe around $230 on it. It’s 4 bed, 3 bath and around 1950sqft in a desired neighborhood. Interest is great at 2.75%!! We just had our third child and would like a house with same or 5 bed but mainly more square footage. House should sell for around atleast $400k now. Is it dumb to sell in order to leverage equity on bigger house for comfort or just sit tight? Wondering if market is really ever gonna be around 3% again or if that’s just a dream. Thoughts?