A couple of notes.
You may not have identified the product / market fit in terms of what McKinsey or others is actually selling. It really may not be the best product / best solution you are so intent on forcing them to sell. Sometimes it literally is political cover for mgmt to do something they (or sometimes even the board) WANTS to do. There is so much secondary level stuff here in terms of politics, job skilling or deskilling etc. I was part of a $10M deal (as the user unfortunately) which was SOO horrendous I became convinced it was just to spend out a govt budget line so a bunch of folks in govt got to go to some fancy training conferences. Truly ancient tech - you had to pin older OS / IE / Java versions to use the solution (no upgrades), but the buzzword bingo slides were amazing, and the agency using them liked them (at the top) so they were selling to the right audience (not actual users).
The big mgmt co's have been very successful in moving the middle class out (focus is on creating a bunch of generally super highly paid execs, and then a bunch of "do what we tell you" workers who are generally poorly paid). So that "do what we tell you" ethos is there (and has resulted in $8B+ annual revenue!). The idea though is to lower the skill level of workers. IT / automation is now going to play a bigger and bigger part of that - so lots of additional growth opportunities for these folks.
Middle class used to include the long tenured employees with experience and some levels of delegated decision making and corresponding pay (basically managers of various forms). Mailroom to boardroom days are over.
"Production workers did not escape the whirlwind, as companies—again with help from consultants— stripped them of their residual management functions and the benefits that these sustained."
You might find this interesting.
https://www.theatlantic.com/ideas/archive/2020/02/how-mckins...
If you really think you can outdo these consulting co's go for it, it's a ruthless horrible game (lots of nice folks burn out trying to play it).