How does long term investing work?

Beginner here, please correct my perspective.

I decided to look at nabil’s share price history from 2019 and i’ve come to the conclusion that people who bought at 700-800 a few years ago are at a loss.
I keep hearing the same general notion that “aile kinera rakha ani 5-10 years pachi profit aune badi chances huncha” .
literally a week ago 570-590 bata 500 ma jharyo. How are people profiting like this? dividends le matrai balance garcha ra?
Thank you and sorry if this sounds shallow, i’ve only just begun studying the market

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