I am a SAP consultant. I have no business in mind but I want to get into one. Looking for suggestions.
I think your biggest hurdle to success will be the issue of customer compliance.
As an employee of SAP, you got compliance from customers because of the weight of SAP: "our way or the highway". Correspondingly, those customers give up responsibility to SAP and say, "It's your problem now".
As an independent consultant, you will likely be surprised by the lack of this compliance in clients. Most will argue with you, think they know better when they don't have any understanding of the topic, and do differently than they agree--or do nothing at all. Even while they pay you.
If I was in your shoes, I would filter prospects for those who are willing to give that total compliance...and charge those clients a high value for the privilege. Otherwise, you're probably going to have a frustrating experience given your background.
That is a process suggestion. The question for you is: "What problem(s) do you want to solve for people?" Answer that and you'll know what business to be in.