This has worked for me for 26 years, and I thought I'd share it with y'all. Treat it like eating fish, take the meat and leave the bones.
We all know other professionals that serve our clients. Maybe you sell supplements, you know someone who sells car insurance. When you talk with your client, you could ask them, when was the last time you price checked your car insurance? Half the people you ask will say never. Then you can suggest they have your guy review their policy.
Or maybe you know am accountant. You could ask your clients, when was the last time you took your tax returns to a different accountant for a second opinion, they'll almost always say never.
If you bring clients to your professionals, you're going to get their attention. Then you have the opportunity to tell them how they can refer to you. Then everyone at the table eats.
I hope this helps someone in some small way