Your example already shows how to use best as an adverb. You could certainly declare that after. In the following sentence, however, best is an adjective:
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Best wishes 和 best regards 有什么区别?首先我们来看下best wishes和best regards的大致意思：best wishes：词性为短语，用于表示对某人的最好祝愿，通常用于书信、贺卡等正式场合.
This is very good instinct, and you could.
What was best? if we insert the word the, we get a noun phrase, the best. It is also a superlative, like greatest, or highest, so just as you would use it as an adjective to show that something is.
