A lot of people who do don't want to be JWs anymore are so angry they stop believing in God
Problem is that there is no proof of God especially since bible is full of fables and distorted facts which eliminated being holy which means that if there is a God he's not what bible describes. As for anger, I don't think it has much to do with god as much as it has to do with having our lives screwed over, youth lost, opportunities taken away and so forth.
Preaching when you don't believe
When I learned the truth about wts, I still believed in a lot of nonsense and the bible itself. As you explore more, you will either free yourself of all unprovable beliefs or you will base your beliefs on something that is dear to you without it necessarily being the reality. This will take time as you continue to explore the history, religion and evolution of god. While preaching with JW in service, it won't do you any good discussing bible or god since if you end up studying with them you WILL HAVE TO study wts publications so you end up getting nowhere that way. I'm sure you talked about the bible with householders on several occasion and I'm sure you will remember that the conversation always ended up pointing to wts as God's channel........
If you want to preach your own version of beliefs and on your own, most people also don't care about religion or bible so your success will be similar to that of when you were peddling wts BS. If you want to talk bible with other believers, then you can look for bible groups, or church groups but you must be careful you don't get discovered by other JWs or you'll be DF. While, I'm sure you see a lot of good people trapped in wts, you have to realize that if you ever hit a wrong nerve with any of them, you will hear from the elders. As you also know, JW "friend" are generally not real friends but are conditional associates as long as you agree with all their believes - the day you stop, or make your views known, many of these so called friends will no longer acknowledge your existence - this also includes family members. As I said, generally doesn't mean all but 99% fall in that category of not real friends.
Think about your strategy how you will exit because sooner or later you won't be able to cope with the BS you keep hearing. If you're young, as it appears, think about going back to school and take some useful courses that will help you in the future. If you have a trade, then that's a big plus. Look after yourself first and plan your future as wts will not do so for you.
take care.