So Bitcoin is King.. why is it?!

I understand for the past years, Bitcoin has been the king of cryptos, but why is that so? I have been for several months now reading a lot about the whole crypto ecosystem, i even bought several bitcoins back in August.(sold them all today, for 4x returns and am keeping all the money in the broker account, and maybe i'll buy BTC again just as soon as i manage to retrieve my belief in BTCs future viability -i am trying really hard).

So i ask again what makes Bitcoin the King? Network effect? The fact that it has been time-tested longer than any other crypto?