Full disclosure: I fit into several "diversity" groups myself.
First, check and see if you don't already have it.
Many people, especially those of us who are older, don't advertise some traits that fall under the "diversity" umbrella.
LGBTQ people were usually "in the closet", as back in the day being "out" was far more dangerous than it is today. Being "outed" was enough to threaten careers, and you couldn't get a security clearance if it was found out, due to fear of the risk of blackmail potential.
For people with disabilities, the hatred wasn't there to the same degree, but it could still keep you fromn being hired. People with autism still have quite a hard time, as do other people with disabilities.
So, some of your people may already qualify. There are also people with mixed race backgrounds which may appear to be of a different ethnicity.
After that, a good thing to do is start an outreach program, and partner with agencies who can find QUALIFIED candidates. Your local department of labor can help, specifically, vocational rehabilitation can get you in touch with groups who can provide you with contacts at local groups who specialize in providing qualified candidates with disabilities.
Advertise openings in publications (online and off) that are targeted towards people you want to attract. Start an outreach program in impoverished communities as well.
Be somewhat careful with groups who are strictly advocacy groups, as some of them care more about quantity than quality. Though a quick conversation with them, and a little asking around can help screen them out.
Lastly, don't settle. There are plenty of qualified people of all backgrounds out there. If you play the numbers game, instead of going for quality, you are going to end up causing more harm than anything else, as the person will be feeling out of their depth, and may well be, and your current employees may only see that person as a "diversity hire".
Moreover, just going for the numbers is a kind of bigotry in and of itself, as it assumes that those of us in certain categories are unqualified, incompetent, and cannot make it without help. This is not the case.
NOBODY wants to feel looked down upon as only being hired due to an immutable characteristic. They will end up hating you. I can almost guarantee that.