You are right,sometimes people specially the newbie rush to buy when the market is green which is really risky because during the market is green the price will high almost all of the coin is rising and we need a big capital of money to buy, while in red market the price is too low but it seems like no one want to buy during bear season because of fear the the red market will continue for a long time, new investors has a regrets all the time i experience this before so i knew how it feel.
Buying when the market is already in green in some situation isn't a bad thing to do based on your explanation because since nobody knows how dip the market will fall it'll be risky buying doing this times unless you have intentions of holding for a very long time then it doesn't matter when you buy as you'll be in profit in the future but if you want short term gains then you have to time the market and invest when the market is on the way up.
How you can know the market is on its way up is when it's green because that's when the market will be pumping and you can also make some gains during this period but you should also take profits early so you don't miss out on your profits because of holding too long.