Looking for advice on how to ask for a raise when I can't find solid data in the market to make my case.

Looking for advice on how to ask for a raise when I can't find solid data in the market to make my case. I'm in a position that requires me to wear many hats and my title does not entirely reflect all that I do. I am the office manager for an office of about 50 people which is part of a larger organization. Within that, I also perform project coordination as well as oversee the entire support staff for our office which is 6 people who perform different roles as part of the support for our office. I also act as the HR for our office although I do not entirely handle all of the HR stuff like benefits, payrolls, etc, we have a separate entity who does that for our entire organization. My main focus is organization development. I work hand in hand with our leadership team to manage our staff, and resources, develop policies, identify gaps in terms of team development, and figure out the best way to fill those. I also do all of our event planning, and some recruiting ( I used to do it all but they finally hired an internal recruiter for our region a couple of years ago). I have taken the support team to very high levels compared to how things were when I first got here. I'm a go-getter and have a great work ethic. Not afraid to roll up my sleeves and clean a fridge if I have to but I'm also experienced enough that I can help lead and guide others as needed, even our most experienced staff.

So to my question, how do I quantify what I do and compare that to what the market currently is.

I have 20 + years of experience in our field and can pretty much handle anything thrown my way.

I would love to hear any insight you may be able to share with me.