You’ll need to remove the SSD and disconnect everything from the mainboard. I can see that the camera, speakers, WiFi antenna, and the two flat ribbon cables (where the battery was) are still connected at least. Check under all of the fabric tape, most of those are taping down connectors that you will need to disconnect.
You do have all the screws out (including the CPU heatsink screws which do fix the board down to the chassis), so after disconnecting everything else it should lift out. The mainboard isn’t glued/adhered down, but it is a tight fit so it may require some very gentle wiggling to pop it free.
