I think it's best to buy alt now since the next fork date is uncertain. Try to buy altcoins that are good for long term investment and you will definitely gain some profit. due to the delay of the fork, alts are soaring high as of the moment and it will continue to do so over the next days.
Yeah, you might go to bed one day and the bitcoin correction happened overnight, lost a ton of btc/usd value and the alts have already pumped. Now is definitely the time
trust your instinct and always think positive in which coins you invested your money better buy a lots of good project and wait for that project to bounce up,
there's a lots of possibilities that anytime is the right time with alts is just like how bitcoin works, downfall will followed by pumped up.