"I would like some advice on growing my business" is terrible.
A better one is "I've been using SEO to grow my business and want to start TikTok ads, what creative have you seen work very well on there and why?"
2. Explain why you think they might be useful
"Based on your experience of doing x, which is similar to what I'm doing, how would you do y?" Shows you care, and far easier for them to help you because you've set the context.
3. Don't ask for calls straight away.
You don't know each other, why on earth should we get on the phone??
4. Start with small asks
Ask for small stuff, get them used to you not being a drain on time then scale up from there. Classic "Influence" by Cialdini tactic.
5. Ideally start with value.
I've built relationships with people by doing audits of their site, rewriting copy for them, building out funnels before even contacting them. Just do something that shows you're not leeching! "