Bitcoin was the first cryptocurrency that was created and all other coins tried to achieve such success but it didn't work. No other coin managed to rise the value so much from the moment it was created like Bitocoin and no other coin isn't so accepted and implemented in real life, people still trust it the most compared to other coins. I think that is the secret of success.
I think it's true that only bitcoin has experienced an increase, maybe because bitcoin, the mother of all crypto, and the belief that bitcoin can be applied in real life