Yes you are late to notice bitcoin rally up so quick and high. But it's never too late to invest in bitcoin.
If you truly believe in bitcoin then you can buy it at whatever the current price is because it has the potential to break the $100k barrier.
I believe bitcoin will even cross $500k within one decade. If you think the same then the current price is still a good price to enter again.

Buying bitcoin for now is kinda risky bitcoin @40000$ is to high, but if you find a great support in bitcoin well I think invest because it will not go deeper, and as many groups in telegram said it will go 42000$ this week or this month but be careful and #DYOR it is OP's money after all, so if that 42k is true well it will be a gain for him if he buy now, many people keeps on hyping it but CNY is fast approaching I'm afraid that it could affect bitcoin price too.