The best of us refers to the members of a group who excel in some way that is pertinent to the group's identity, focus, or sense of purpose and duty. The group can be a small one or it can include everybody.
The word "best" is an adjective, and adjectives do not take articles by themselves. Because the noun car is modified by the superlative adjective best, and because this makes the noun car definite in this context, we use the. It is best not to do something. Here, we have the adjective best, but this adjective is attached to no noun.

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Do all these sentences sound good? 1. Make the best of your time. 2. Make the best of everything you have. 3.Make the best of this opportunity.
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Agreed that it's a little ambiguous. I also haven't heard the phrase before today. My initial thought was that it meant "The corruption of the best [thing] is the worst of all [possible things]." For example, the corruption of the kindest people on the planet would be the worst possible thing to happen.

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Steve's suggestion is the best, but if you want to apologise in a more formal way, then: I deeply regret what occurred, and I promise that I will make every effort and do everything in my power to prevent its reoccurrence.