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Not a lot, main thing is not to rush back to riding straight away. You'll have inflammation in various places and most of those aches and pains will settle down with a bit of rest. And get plenty of sleep.
Sounds like you had pretty much the right kit. If your legs are cold it doesn't necessarily mean you need more layers on your legs, might be better to put an extra layer on your core. If you are cold, do put on more clothes. You shouldn't need to freeze to stay awake!
Any thoughts on recovery from a 600? I had a bit of knee and achilles swelling which seems to have let up but still feeling pretty wiped out at this point.
Rode with my down jacket this time but didn't put it on until I stopped at 4am during the night at a control - was feeling pretty cold but worried I would get too warm and fall asleep if I was riding in the jacket. I had merino winter base layer, perfetto jacket and a waterproof on top with winter gloves and running tights on over bib shorts - top half was warm ish and legs were cold. Could maybe get some winter cycling tights with no pad to use during the night...