Volunteering can be a great way to meet people in general. There are services geared toward more social group activities like meetup. Try finding local hobby/activity communities online like on discord or Reddit or Lemmy!
I know how much we hate Reddit here but I've had great success with meeting people through local area subreddits. Many will have a monthly meetup and you can just go hang out and meet people in a low pressure environment. Then as people get to know each other smaller groups can form. Some also have Discords which can be a nice way to ease into the group before getting out there in person.
Honestly, dating apps can be really good for this. Although polyamorous, I state in my profile that I am also open to just friends and my interests. Two of my best friends I met 4 years ago via Tinder. There are plenty of folks looking for friends on them. It especially seems like that for OKC.
Edit: most of my trans friends have been on a local discord community or through people I met on it.
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