raising sunken living room floor ideas

The home i purchased last fall had an addition put on it a little over 20 years ago. It is a large 17’x26’ room, used as the main living room for the house. The current flooring is carpet and the top of carpet is about 4” lower that the top of tile in the adjacent room (the entrance from the rest of the house to the room is a 6’ wide opening that used to open to the back yard.) The carpet is in poor condition and needs to be replaced. Pulling up the corners of the carpet exposes the concrete slab underneath that was not finished smooth- it appears rougher than a broom finish, and not very even. Ideally, I’d like to install wood floors in this room and installing anything but carpet I’m sure would require placing some self-leveling slab topping at a minimum. While replacing the floor, I would prefer to raise the floor to match the rest of the house elevation (to alleviate some worry living in a flood zone plus it would look better). The three exterior walls are wood framed (1 interior block wall) and there is a double door leading to the backyard. I have been thinking that pouring concrete would be the way to go, but am unsure how to treat it at the walls and door. I’d be okay with re-framing the exterior door opening to raise the door above the new floor. From what I’ve read, I understand that I would want to break the bond between existing concrete and new. How would I treat the concrete at the walls? Do I remove drywall and put formwork on the interior face of the wood studs and sole plate?

Would building a wood sub floor be more advisable? I think I would still need to level the existing slab if I went that route.

Thanks in advance for any suggestions or ideas.