I have sold several companies -one for mid 6 figures, yet I'm not a millionaire. Who is best suited to coach me to reach my goal of 30M net worth?

Hi, this is Carlo, a business and executive mentor and strategic financial and efficiency/productivity consultant.
It is always a good idea for an entrepreneur to hire a mentor or specialized coach - it will keep you on a highly focused track with while making sound and progressive decisions.
From the few lines you wrote, I gather that you have set a solid ground work but face difficulties in optimizing and growing your undertakings. You might even be spread too thin and encounter difficulties in prioritizing, which holds up progress in all arenas.
Depending on your precedence you either need a business mentor that can help you with all your undertakings or you need a specialized web/internet business coach.
Either way, I can help you as a business mentor or recommend some terrific internet coaches.
You have set the ground work and the next level is around the corner, go for it.

You can also start by self coaching.

Here's how...

Each time a task comes up + you say to yourself...

"Gee just easier for me to do this, rather than explain it to someone"... or...

"Best I do this task, as I can do it better than anyone."

These are clues to where you can increase your net worth.

Delegate.

One of my businesses use to take roughly 80 hours/week of my time. When I considered how to double my income... well... working 160 hours/week... the numbers didn't work...

So I systematized this entire business.

No I spend maybe 5-10 minutes/week in this business.

Oh... And when I did this, first 30 days, gross revenue increased substantially.

So I also learned, "The only thing holding back my income, was me working in my business."

Said another way, "Any money you're paid for no work produces near infinite ROI."

Always get yourself out of the mix + go for high ROI.