People say "don't buy at the peak". That's wise advice in hindsight. The problem is when you're at the peak you don't know that you are there. Is this the peak or is it a "false summit". looking back i thought $20k was the peak. it clearly wasnt. So my view is yes its fine to invest at this price (as long as you can afford to lose a significant chunk if it goes pear shaped)
There is no fixed peak to be honest.
As no one has seen the future right, so it’s unpredictable what will happen.
Similarly there is no perfect time to buy or sell the coin. Whenever you can just do.
So seeing the date of the OP, Those have actually bought coins that time currently will be having more than 10k USD profit.
Rest is upto us.