Is now the time to buy altcoins or will they fall more before btc stops going up.
you haven't told us which altcoin yet.
but since you ask generally i tell you generally too. when you want to buy an altcoin you should look for the bottom. right now they are being dumped and bitcoin is unstoppable in its rise which means more altcoin dump in general which then means the bottom has not reached yet.
remember one thing though, pump and dumps happen randomly too which will defeat this rule above.
No, I don't think so as many altcoins seems increased in the last 24 hours, just go on and check the market price.
I can't recommend which one of those coins (too many and a lot of factors affected it) that may keep rising and has more investors, but since bitcoin price at higher level right now,
it is the right time to purchase an altcoins that has good potential.