There is no free will, but choices matter, and this isn't a paradox, your desires, intentions and decisions arise out of the present state of the universe, which includes your brain and your soul. If such a thing exists, along with all of their influences are part of a causal framework.
So your choices matter whether or not they're products of a brain or a soul, because they're often the cause of your actions.
Imagine that I want to learn to speak Mandarin.
OK, how is that going to happen? It's not going to happen by accident only to attend es or hire native speaking tutor or travel to China. I'll need to study and practice and this will entail a lot of effort. I don't get frustrated and embarrassed by my failures, and I have to overcome my frustration and embarrassment and keep learning my decision to learn Mandarin and all of the efforts that follow, if they persist long enough, will be the cause of my speaking Mandarin at some point in the future badly.
I'm sure it's not that I was destined to speak Mandarin regardless of my thoughts and actions. Determinism isn't fatalism, Choice's reasoning, discipline. All of these things play obvious roles in our lives, despite the fact that they're determined by prior causes. And again, adding randomness to this machinery doesn't change anything. But the reality is, is that I show no signs of making an effort to learn Mandarin. It simply isn't a priority for me. Am I free to make it a priority?
Well, in some ways, yes, but not in the crucial way that the common notion of free will requires. I can't account for why I don't want to speak Mandarin more than I do. I can't decide to make learning this language my top priority when it simply isn't my top priority. And if I suddenly became the most important thing in my life, I wouldn't have created this change in myself. I would be a mere witness to this change.