Bitcoin rally today is huge and it must end at some point.
Now I want to swap part of bitcoins into alts with only one goal - to gain bitcoin value. What do you think? What alts will raise in bitcoin price in next days if bitcoin begin to fall in dollar value?
If you look carefully alts are also rising recently, some of them with much larger gains than bitcoin, so although what you are saying is common, is not what is happening right now. If you look to coinmarketcap, almost every coin is on green, and this has been happening for the last 2 or 3 days. Given this, I don't really know in what alt you should try to invest because we might see a correction on every coin, and not just bitcoin. I wouldn't do anything right now if I were you.
Normally either bitcoin is moving up or altcoins are in positive direction but not both. Last few days are especial in a way that both bitcoins and altcoins are moving up. i didn't see this trend before. Maybe it is due to year end where all the coins close at a high each year. Last year we say bitcoin reach 1000$ which was all time high at that time.