Another thing you could try is browsing to the '..\Documents\Larian Studios' folder and renaming the 'Divinity Original Sin' subfolder.
This folder contains the saved games, configuration files and a level cache folder. Deleting or renaming it will get the game to recreate it on startup; playing the game from a different Windows user account would effectively do the same thing.
After that, start D:OS, create a new profile, exit, and then copy your latest save from the renamed folder to the newly created profile's savegames folder. If that lets you enter Luculla Forest, then move the rest of your saves to the new profile. If it also crashes, delete the new D:OS folder and rename the existing one back.
If that doesn't help, please email supportdos@larian.com, with a description of the problem and the report.zip file generated by the
D:OS support tool (for the PC version). The report will contain system and game information, any crash dumps, and your saved games. If file size is an issue, any saves not related to the problem can be deleted (so you could just leave your most recent save, beside the bridge).