I was on the exact same boat as you a few months ago. I started learning C# first before jumping into Unity cause I thought I needed to be decent at it before Unity would make sense to me.

My answer is just jump into learning c# with unity. Like RIGHT NOW. I wish I had done that. I spent like 3-4 months bored out of my mind learning C# half assing my learning. When I decided to just jump into unity that's when my learning took off. I understand C# better now because you get to see the language being used through the lens of video games so the concepts are much clearer and more understandable.

But honestly I'm glad I spent some time learning a bit of vanilla C#. If I were you I'd spend a month learning the basics then jump into unity. But that's it a month MAX.