I know it's not only mine but story of most of us who didn't invest into bitcoin once it crossed $20k mark assuming it would go through correction phase but it has gained almost 100% more since that time and I am not sure if it's worth risking to invest into bitcoin when it's nearing $40k?
Please share your opinion without any generic response like "there is no good or bad time to invest into bitcoin".
When the value of bitcoin went over $20,000 USD, you didn't invest because you thought it might crash soon or right away. Now you are regretting. The price is at around $39,000 USD, you think it might crash, so you are hesitating to invest. When it doesn't crash, you will start regretting once again.
No one knows if the price is going to crash or not. It is useless asking people if "YOU" should invest or not because they no nothing about you. You know yourself better. You know your financial condition. Thus, its you who can make the ultimate decision.
If you are willing to hold for long term (like 2/3 years) then go ahead invest. If you are willing to make some quick profit, then I would say no if you can't afford the loss.