Which holidays should we continue?

Considering some people would like to get rid of daylight savings time, as well as the electoral college, is it now time to reconsider holidays as well?

Should we celebrate Thanksgiving since we basically discovered and stole land from natives and sublimated them?

Since theists are decreasing in numbers, is it time for Christmas and other religious holidays to no longer be a National holiday?

If all paid holidays went away, what could we replace those with?

Or are there existing days we should celebrate instead, with a higher priority in the current culture?