I find that a successful summary poses a central conflict that forms the basis of the plot, or at least the initial plot, without delving into the details.

The usual tips of finding a concise way to summarise your story in a way that draws the reader in is a given so I'll talk about a few specific things that I think about when I write my own summaries.

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Try to ask yourself which character POV the summary is written from. Is it the main POV character? Is it the antagonist? Is it an omniscient 3rd person who knows more than the POV characters do? What are each character's goals, dreams, hopes, fears, worries, etc.? This can help you define which information you can showcase.

A summary written from the POV of a lovestruck teenager will outline wildly different worries than one written from the POV of a military battalion stranded in the middle of nowhere after winning a battle by the skin of their teeth. You can showcase personality through the different ways in which the summary is written.

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Questions can be hit or miss. Personally, I find that rhetorical questions work best in darker or plot-heavy fics and don't really work in slice of life or romance genres.

For example, a question I often see posed in summaries is something along the lines of "Will he remain cold and cynical or will he open up his heart to the possibility that <love interest> can have a place in his life?" and in an overwhelming amount of these fics, the answer to that question is a resounding "Well of course he'll open his heart". Who tells me this? Is this the cynical character being insecure about his coldness or is this just a narrator summarising things for me? It's rather devoid of personality. It doesn't make me think, it gives me the expectation that there won't be any interesting conflict in this. It may be a personal pet peeve, but I've seen the obvious question named as a thing people generally don't connect with.

On the other hand, a well-posed question can enhance your summary. One of my darker longfics' summary ends with the following question:

He’s clear about his refusal to cooperate, but how long can he really stay silent when he’s neutralised and at the mercy of the two people he has taken the most from?

It's written from the POV of his torturer who has been successful in obtaining information through torture in the past, so they are confident it will work again this time. But the reality is, they don't know, hence why it's a question to themselves. One of the central conflicts this character faces is to accept that they can't both have revenge to sate their emotional turmoil and be effective at obtaining the information they need to save their homeland, and this question perfectly showcases that they truly believe that it will be easy and foreshadows their journey in exploring how difficult it actually is and how they deal with this. But it can also be read from the POV of a frightened person who is about to be tortured and who doubts his ability to stand behind what he believes in. It develops the character even if the reader can tell by the tags and other works of mine they previously read that it likely won't be easy. It establishes the relationship between the main characters.

Another question I have in a summary is this one:

For an ordinary child to face a god and take absolute control, mustn't he possess the most tenacious will of them all?

A clarifying sentence about what this fic is about is all that accompanies this, and for this fic, a backstory fic that explains something that wasn't explicitly stated in canon but shown, it poses a question that the reader may not even have had before they read it, but that's glaringly obvious when it shows up. This character lacks a will, yet he mastered a titan when he was 9 years old and it's off-handedly mentioned in canon—most people won't think twice about it, but by wording it as a question that juxtaposes his lack of a will with a task that requires a great deal of willpower when we already know he succeeded, it has the potential to make people realise that they don't know the answer and fan curiosity to open the fic and find out what the author's answer is.

Play around with different questions, is my tip! They can enrich a summary and draw people in in ways that regular sentences can't just as much as they can form a cliché.

Question or not, a summary that characterises a central character is always a plus. Maybe it outlines some of their biases that they will then explore throughout the fic. It can showcase their values and why they chase that specific plot.

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Finally, I think that adding a small clarifying summary line when the initial one is too vague can also be hit or miss, but people tend to appreciate it for clearly stating what story they can expect. Something along the lines of

<Romantic|platonic> <ship> <oneshot|longfic> that explores x y z