I left the cult in my 20s. There are some things that I did right, and some things that I didn't do that could have made transitioning so much easier.
First, stop using their language. Use the language that the rest of the world uses. This helps other people relate to you when you do talk about your past, but it also helps you to think like the people that you want to be in a community with. It is also a part of deprogramming.
Jehovah's Witnesses = fundamentalist Christian religion (or in my case a Doomsday cult)
Kingdom Hall = church
Sunday and Weekday meetings = services
bible study = bible study (this meeting where groups meet outside of the church to do bible study is actually quite common in other Christian churches)
assembly (all of them) = convention
Brothers & Sisters = church members, parishioners, you choose what works for you
Elders, circuit overseers, the Governing Body = ministers or pastors
Governing Body (if you need to make the distinction) = church administrators
You can easily look up titles to make changes to your vocabulary.
Others have already give you great advice for navigating making new friends and creating your chosen community, network. I'm going to tell you something that I find most of us do not want to hear.
Get therapy.
I left and did what I could to separate myself from the cult. I changed my language. I got right out there and started making friends. I got into romantic relationships. It was a decade later before I realized that I had significantly underestimated the impact that the JWs had on how I relate to people. I was born in. The JW way of relating to people entirely shaped me during the formative years of my life. I think people who join later are also effected by this. For me, I don't know what I don't know. I can see all kinds of areas of my life that I can change to be a better person and to separate myself from the cult. But I cannot see the intricate details of my interpersonal relationships and where I might be going wrong. Just yesterday I realized that I need to find someone who is a step between a therapist and a life coach to help me work on my friend skills. I've come so far, but I am incapable of seeing what I need to see without someone else to help point it out to me. I need to learn from someone who can articulate it and help me find the tools necessary to make successful relationships... even just friends. I got therapy to deal with some PTSD issues and it helped. I didn't do a lot. I did not get therapy to help me navigate interpersonal relationships, and I now think that I could have learned so much and gotten better at relationships so much faster if I had. Therapy/counseling doesn't have the stigma that it used to have and there are so many different types available now. There are support groups that meet online, like on Zoom, and just share their struggles. Some are formatted like support groups while others feel more relaxed like friends meeting up. You can even make some friends with people who share a similar struggle.
I realized just yesterday that I haven't been making the friendships that I want to make. Making friends is much harder as an adult. It isn't just that you are no longer thrust together in an environment where you are forced to interact with each other, as children are. It is that the other adults aren't interested in making those connections. People will make those connections given the opportunity, but they aren't seeking it themselves oftentimes. You really have to work at it. I have 2 friends right now. They are really good friends. I have acquaintances at work. I'm going to try Meet-Up to see if I can find a group that gathers to do artwork together. I'm not a naturally social person. I'm fine all by myself. But it isn't healthy. And at the end of my life, I want more than 2 chosen people by my side. I want to make a difference in other people's lives and have them make a difference in mine. I feel like I have a lot to give.
I hope this helps and I hope you can start making new friends and creating a choice family soon.