My question is it safe to invest BTC at the current price?
Do you have any other Altcoin options?
If you ask people on here for sure you'l get a mix of answers and suggestions...
Now, if you ask me, I'd say to you that Bitcoin will never reach 20K so if you want to invest in BTC (which I can only recommend after you made your homework and read a little about what it is etc) now might be a great time.
What I'm ultimately saying is that the long-term potential for BTC is likely huge, so if you wanted to be part of that it doesn't matter much whether you buy your BTC at 45 or 55K because you know that in the long-term this becomes irrelevant.
Getting into alts is relevant for the type of investor that doesn't just hold but changes and shops around various ones. If this fits the profile of your friend looking at top alt might be an option also but BTC (in my view) is by far the easiest and less hands on.