To the experienced coaches and consultants here, if you can give 1 tips about sales/self-promotion to a newbie, what would it be?

So I’m starting up my own marketing consultancy after more than 7 years in global marketing for both B2C and B2B. I’ve got everything set up and ready, yet my biggest challenge is to… start sell 😅 I find doing outreach and self-promotion so hard. Maybe anyone can inspire me for a mindset-shift around this? I’d love to hear it pls 🥹