The truth does not need a majority to be true.
Why most people saying no changes nothing
The surah opens with letters whose meaning is known to Allah, a signal to stop and listen. Then it says plainly: what was sent to you is the truth. The Prophet ﷺ had been calling people for years, and most still refused.
You post something you care about and get three likes. Your friends all skip the prayer, so you start to wonder if you are the odd one. The room goes quiet when you say you do not drink. A crowd can be loud and still be wrong.
If most people do not believe it, maybe it is not that convincing.
The truth stays true even when most people walk past it.
Next time you feel like the only one doing something good, pause and say: I do this for my Lord, not the count.