Bitcoin has the largest market cap and is the most adopted crypto. There are many other weak cryptos that might end but not Bitcoin.
It is not only about the market cap, but about the brand bitcoin. If people talk in TV about crypto they will for sure mention bitcoin but only in some cases mention another currency. For a lot of people crypto = bitcoin and this will stay like this probably forever. The only time people speak about other coins is when there is a shitcoin having a huge pump, but that is mostly forgotten after a few weeks.
Branding of bitcoin is very important. I mean I know that there isn't a company behind it doing marketing, but it has marketing of its own and brand of its own without needing us. This is why I agree that we shouldn't really be doing anything that would be considered as marketing for bitcoin while looking like owners, we can't do that.
We could however support it like fans and that is what the whole world is doing. Even El Salvador making it a legal tender is literally being a fan of bitcoin, but as a government and not as a person (or maybe person, since president did it). This is how you grow bigger, and this is how bitcoin becomes more known and liked as well.