I joined some Lemmy communities in the target language and browse the comment sections from time to time. It's not super important the topic is interesting. I just use it as a source of natural language, to see if I can get the gist.
Sometimes I watch videos on grammar and pronounciation. And of course, talk to people who can speak that language in that language!
From time to time, I ask ChatGPT to have a conversation with me in the target language, but I need to improve my skill further to participate.