picking a winning alt is going to get a lot harder so unless you're a very very big student of crypto then sticking with btc is probably going to return you way better results long term
alts are diluting to nothing
there are perhaps at best 8 alts that are solid picks at the current price ... but finding them is not easy for 99% of people
most are not even in the top 100
If your holding bitcoin for a long time and the market suddenly drops very big I thinks there's no need to sell it to cut losses all we need to do is to be patiently waiting until the market price increases.