This is the most common mistake being done by the new users. When I was new here, I was also thinking the same way. I gave more importance to the alts and accumulated a large number of different alts and tokens. And then I learnt my lessons the hard way. First of all, the price of all the alts are dependent on Bitcoin. And secondly, most of them were created to poach the users of Bitcoin (although there are exceptions such as Cardano and Ether).

If you look at the technology behind these alts, you can see that none of them has the capability to replace BTC. They are having value just because some people think that they'll also give good returns like BTC.