I have finished the game and the DLC's show up on the right side of my main menu as active. I went back to the previous save before the point of no return. Talked to ADA and no dialougue to start the DLC quests. What am I missing here? 😪

If the dialogue to begin isn't showing up for you and your save isn't endgame pnr, then try another save or try starting a new game. Your save may be corrupted. If you installed the dlc corrcetly I can't think of another reason.