I agree with you that there are a lot of bitcoin competitors and may be able to replace bitcoin. But this is not easy to do, it is very difficult and has little chance of doing.
I believe the main enemy of bitcoin is not a crypto, but people who hate and dislike bitcoin.
Yes, people do not like bitcoin so much that they buy it and store it in their purses, thus raising its price and making it swell as a bubble. Then they themselves will provoke a panic when the negative is launched, even if it is misleading information and they will be afraid to lose their big savings in bitcoin and start selling it massively. Such actions that are obviously unfriendly to bitcoin can lead to its devaluation.