The fear of losing clients when raising rates is almost always bigger than the reality. Most freelancers who raise rates thoughtfully lose zero long-term clients and gain significant margin.
The key word is "thoughtfully." Not an apology. Not an explanation. A clear statement, delivered with confidence, that treats the rate increase as the normal business event it is.
Don't apologize. Don't over-explain. Don't ask permission. And don't give a range — "I'm thinking between $X and $Y" signals that you're negotiating with yourself before the client has said a word.
State the new rate, give a transition date, and offer existing clients a grace period. "Starting June 1st, my rate moves to $X/hr. Projects we kick off before then are locked at the current rate." That's it.
Clients who value your work will stay. Clients who leave over a rate adjustment were never going to be long-term relationships anyway. The sooner you make space for better clients, the sooner they arrive.
A common rule: raise until one client pushes back. If everyone accepts immediately, you haven't gone far enough. Friction is signal. The goal is to find the edge of what the market will bear, not to stay safely below it forever.