$150 per hour. $120 per hour if the project is big enough that you won’t have to look for work for a while. $100 per hour if you’re really hungry.
I’m sick of reading blog posts about how much to charge. They don’t tell me anything I don’t already know. And they never tell you how much to charge. You’re welcome.
Someone reading this post is charging half that much. You are doubly welcome. You won’t make any more money but you’ll make the same doing half the work. Use that other time to improve your skills.