What is the real cost of giving up your rate?
This is the variable everyone leads with, so let me address it directly. If you locked in a low rate during the 2020 to 2022 window, that rate is a financial asset. It is not pretend. Trading it for today's rates carries a real monthly cost, and any honest agent should say so out loud.
But the rate is not the whole monthly payment, and it is not the whole decision. Here is the question that actually matters: when you apply your existing equity as a large down payment on the next house, what does the new monthly payment look like, and how does it compare to what you are paying today? Putting a sizable equity check toward your next purchase shrinks the balance you finance. The rate is higher, but the principal is smaller. The blended monthly cost is usually closer than people expect.
Run the math, then make a peace-of-mind call about what the gap is worth. If the new payment is modestly higher and the next house solves three real problems, that is a defensible trade. If it is sharply higher and the new house solves one cosmetic problem, that is not.
Tool for this variable
Buy-Before-You-Sell calculator