It's best to leave your altcoins, you can sell a few if you want. It's always advisable to not put all your eggs in one basket, in this case Bitcoin. Bitcoin might get to 20k in five years, or it might just get replaced by an altcoin, no one knows

Yes, surely. They will survive

Thank you, very useful points I can easily follow

#Proof of Authentication

Telegram username: @dramazing1740

Bitcointalk profile: https://bitcointalk.org/index.php?action=profile;u=2073923