If you cannot judge where the market's sentiment is heading, you can look at the Bitcoin Fear Index or observe the liquidity situation of most altcoins.

A market with no liquidity is a market worth paying attention to; it often indicates that the enthusiasm has significantly waned. You can either wait and see or start dollar-cost averaging early. Due to frequent surges and drops, swing trading is also worth considering.

There is no rise without reason, nor is there a fall without reason; behind it all is the game of expectations for the future.

Investing is about enduring a period of being broke until you reach a period of being wealthy, from a market full of bearish sentiment to one where the bearish news has been fully absorbed and good news is continuously released, a market filled with crazy liquidity.