to decide to buy you should not be in a hurry.
to what extent the price decline will occur no one can know for sure, but now it looks like the sharp decline has ended the price has stabilized in the last 24 hours. maybe if you believe that Bitcoin or Altcoin will be able to get back up at a time like this it is very appropriate to buy.
however,
Its hard to buy in rush situation since we don't know the outcome of the market at the end of the day also we should do more careful technical analysis on how the market flow since if we bought at wrong position then provably we will just get panic if the price fall. So best to wait for ideal price to buy since we don't have anything to wait and it seems we will not see any huge pump for this year.
If you just believe on bitcoin and you think for long term hold then maybe any price will be suitable since most provably in next halving we can see good price action towards bitcoin at that time.
If you wont rush then you would really be missing out the train once it would make out some reversal? Some do really have this kind of mindset and made out immediate reactions to that.
Whenever do someone do sees for a declining market then we would really be having those thoughts in mind on searching for the possible bottom price where you would really be looking for.
Some might be that keen on taking up position due to some risk factor or something in correlated with emotions in the time on making out some trades.