The number is less useful than the band. A band tells you what kind of problem you have, which tells you what to do.
Weak
Something structural is missing. Usually whole sections with no content, roles with no bullets, or a document that hasn't really been written yet.
Do next: stop optimizing and finish the draft. Give every role two or three real bullets. Fill in contact details. Add a title or a summary. Scoring can't tell you much about a document that isn't there yet.
Developing
It's a real resume, but it's describing a job rather than proving you did it. Typically bullets full of duties, few or no numbers, and a lot of adjectives about yourself.
Do next: rewrite bullets into action, scope, result. This is where the biggest single jump in score usually comes from, and it's the one that helps most with a human reader too. See writing bullets that land.
On track
Solid. It reads well and it would hold up. What's left is usually tailoring: language from the posting you haven't picked up, a must-have you evidence somewhere but not prominently, an ordering choice that buries your best material.
Do next: work the match half. Check your keyword chips, make sure every must-have you genuinely meet is visible, and move the most relevant role or bullet higher. See reading your keyword chips.
Strong
Ready to send. Remaining suggestions are refinements, and it's entirely reasonable to ignore them.
Do next: send it. Then get on with the parts that matter more than another point — the cover letter, and interview prep.
The bands don't flicker
A one-point wobble won't bounce you between two band words. The band only changes when your resume has genuinely moved, not when a number twitches at a boundary. A label that changed every refresh would be a label you couldn't trust.
Two things worth knowing
Scores top out below 100 on purpose. 90-plus is excellent and ready to send. See why scores don't reach 100.
A low match with strong writing isn't a writing problem. If your presentation dimensions are strong and your match is weak, the posting is asking for experience your resume doesn't show yet. The Breakdown lists what it asks for, so you can see what to bring forward from your own experience.