Good point. Be ready to leave and have an offer in hand. Otherwise it won't work, you will get even bigger promises while (as others said) they will try to back

Good point. Be ready to leave and have an offer in hand. Otherwise it won't work, you will get even bigger promises while (as others said) they will try to backfill you or fire you on the spot. İf you are the most knowledgable person in the project, that should have the leverage to get what you want.