I started freelancing 3 years ago, my hourly rate was between 25 and 30$/hour.
I have accumulated a lot of experience and I have a better quality clients that pay better than my old clients. My new clients pay an hourly rate of 60 to 120$/hour and I am thinking of increasing my hourly rate for my old clients to at least 45$/hour.
What is a good way to approach my old clients and tell them about my new hourly rate? Should I wait for them to send me a project to communicate my new rate?