We each have personal sources of joy, and sometimes we forget to look for them or think about them. Joy can also be a default mood.
One way to make a day go better is to start with this intention:
"no one may take my joy today", and stick to it.
Thanksgiving Day has so many special aspects that highlight how much we have to be grateful for. You get to pick your focus- family, friends, football, feast, foliage and so much more. It is easy to get swept up in the planning, or to feel sadness if something from the past is no more- Taking a few moments to get quiet, and focus on what is going right can turn that around.