Starting a new job is an awesome opportunity to make a sober start - no one will associate you as a drinker etc. Of course it may feel easier to fall into familiar patterns. A drink to calm the nerves, to get the conversation flowing, to fit in. This is big stuff to work on, to undo however many years of social conditioning. Don’t underestimate it! But it’s totally possible.
There are loads of really awesome sober resources - I read a book called This Naked Mind which helped me think about my relationship with alcohol at the beginning. There are tons more - books, podcasts etc. A decent list here:
Also lots of good tips about socialising sober here - appreciate not all relevant as you can’t necessarily avoid being in the office! But hopefully some helpful stuff 