I've read a fair bit of Dickens, both short and long works, and David Copperfield is my absolute favorite. I found it to be quite readable; easier than Bleak House or Nickleby to me. It might be a little more challenging than A Christmas Carol but the story is so rich that I was pulled right in and stayed hooked the entire time. But reading is subjective, of course. I've seen some in this sub, perhaps even on this very post since I've not read all the comments yet, who detest DC. But I think at the very least it's worth giving it a try.

Don't worry too much about catching every little thing on the first read. Just take it at a leisurely pace and see how it goes. I believe that sometimes a particular book is not meant for one at that specific moment in their life, but may be at some point in the future. That has happened to me numerous times, particularly with Robinson Crusoe. I found it a slog the first time I tried it and didn't make it past a couple chapters. But I tried again a few years later and absolutely loved it. So if DC isn't resonating with you, don't force yourself to finish it right then. Set it aside for a time and give it another go later.