Belief In future clients

I certified in october and got my program together and fully booked 10 clients either a 6 week or 12 week. It has been amazing coaching over the last several weeks.
I’m coming upon ending sessions with some of them and have started making offers for the next round of clients. I don’t believe that they will want to pay for what I am offering.
I notice myself not making clear offers, or not being bold enough because it somehow seems uncomfortable. So, I can visualize my next 10 clients, but in the present, I don’t believe they will have the money to pay.
My brain keeps looping back to this.
Advice for moving past my brain so I can sign those next 10 clients?