Hi and welcome Little Ziggy. Learning to communicate with your alters takes time and process.... LOTS of time and process. So please don't worry that you're "not doing it right" or failing or anything like that. I have been in therapy for many, many years and even now we have trouble communicating with some alters, although with others it is very comfortable and easy now.
The barriers between alters exist for a reason, so building connections and communication takes so much time, and so many missteps. For you right now it might be that simply thinking about developing communication is "enough". It is definitely likely to be progress over "before" when you maybe weren't even aware of them or - if you were - didn't want to have anything to do with communicating with them. So just getting comfortable with the idea of finding ways to communicate is progress towards the end goal in itself.
Sometimes the steps towards communication really that simple and small. Sometimes even a tiny little step requires a major internal shift in belief and acceptance. it can be an incredibly slow process.
And then other times it can be super fast, too.
Just take it step by step!