Which other cryptocurrencies do you own. I'm not saying you can't do it but you'll have to own so multiple smaller cryptos to get enough accumulate balance to own one Bitcoin. If you'll get there operating from other cryptos profits it's going to take a long time it won't be easy.
Even if I don't hold 1 whole bitcoin, the price of the other cryptocurrencies I own may increases by x100 or x1000, which will greatly affect me. I hope to accumulate enough cryptocurrency to be able to afford one Bitcoin someday.