A good title tells the right reader this is for them, using concrete nouns rather than cleverness. Name the specific thing, not the category. Four patterns reliably work: the surprising fact, the direct question, the specific how-to, and the named story. Test it by asking whether someone could guess the content from the title alone.
Include the words a person would actually type, which usually overlaps with the words that describe the thing accurately. Stuffing extra keywords in makes titles read as machine-written and search engines have discounted that signal for years.
Long enough to be specific, short enough that the important words come first. Search results typically truncate around 60 characters, so front-load the substance and treat anything past that as a bonus rather than a place to hide the point.
Yes, if the original is not working. A title is a hypothesis about what will interest people, and hypotheses are allowed to be wrong. Changing it costs almost nothing compared to letting good work go unread.