Really depends on what you mean by useful. Looking briefly through your post history, it seems like a lot of your posts are news / politics. Are you hoping to use lemmy to educate and change people’s perspectives? Because that’s quite a different purpose than entertain and distract, or express an inner artistic vision, or grow the fediverse, and so on.

If you can explain what you seek from posting, we can get a better idea of whether it’s working or not!