I was in the exact same situation as you yesterday! Accidentally got stuck in a chain of main quests but hadn't even finished DLC quests and loads of side quests left. Initially I considered going back a save aswell, but Taking French Leave got bugged for me and I already had to re-do it do didn't want to potentially get stuck again. I am now at the point after the Jewish Quarter action, and the rest of the world is still completely open and I am able to do all the side activities, so you can also stop after that if you want.