After each session, tick the players who got a real scene, a decision that mattered, a moment that was theirs. The number that matters is not who has had the most. It is how long the quietest player has been waiting.
Player names, or character names. Whichever you think in.
Every DM knows they should spread the spotlight around, and most assume they roughly do. Over ten sessions the totals usually are roughly even, which is exactly why the totals hide the problem.
A player with five moments out of ten sessions looks fine on a chart. If all five came in the first half and they have had nothing since, they are not fine, and they have been quietly checking their phone for a month. The number that predicts someone drifting away from a campaign is not their share. It is how many sessions in a row they have gone without.
Loud players self-serve. They will take a scene whether or not you planned one for them, which means they rarely show a drought and rarely need this. The people this catches are the ones who are happy to sit back, which is also exactly who will quietly stop coming.
Not an apology, and not a scene about their backstory delivered like homework. The reliable fix is smaller: give them the decision next session. Put the choice in front of that character specifically, and let the table wait for their answer. Ten seconds of everyone looking at them is worth more than a prepared monologue.
It records your session, writes the recap, and tracks who appeared in which one, so the campaign wiki already knows who has been quiet without anybody ticking a box.
See how it works