DOs:
Do review your termination package and ask your manager questions
Do reflect on the fact that you had a great run at one of the best companies ever
Do spend time with your friends and family.
DON'Ts:
Don't try and second guess whether your performance was to blame or if it was a mistake because you can't change it now.
Don't start looking at job boards. Wait a day or two. You need time to grieve.
Don't blame your job lose on DEI policies. Yes it is true that US has adverse impact quotas, but you can't know for sure that this is the reason you were let go.
Don't open the bottle. Once you start drinking, it will be hard to stop. Save that for another day.