the thing about bitcoin is that it always rises. so it is a safe assumption to tell yourself that bitcoin price will be higher than today's price eventually in the near future. so whatever you make is going to be also an increased profit in fiat too.
there is an ecosystem in altcoin market. price corrections comes everytime.
So for major altcoins it does not really matter. Its all connected to bitcoin price.
the "connection" is not really a direct one though. it is mostly indirect connection and a reverse relationship. meaning whenever bitcoin is hot, altcoins are dropping mostly when bitcoin price goes down.