There is no 100% certain time to invest. You have to be wary of the prices yourself. You need to understand what affects crypto such as:
- regulatory changes (like ones in
Canada and
South Korea)
- Hacking (news about wallets being hacked)
- Crypto Mining Tech news (with increase hash rate, the supply would increase)
- Market adoption (companies taking on crypto or investing in crypto)
There are other things to pay attention, it all depends on how much time you want to invest to research it.
Final word is: You should invest based on your own ideals.