There's a saying: "If there's a will, there's a way; if not, there are many excuses." Ever heard of that?
The thing is, if you see an opportunity to invest, you’ll find a way to make it happen. And did you know that when the market is down, that's actually the best time to accumulate? They say that during a bear market, the weak hands will panic. Are we weak hands? Definitely not...
It is true that the best time to accumulate Bitcoin is when the market is dip because it gives an investor more opportunities of accumulating enough Bitcoin, but for Bitcoin proper investment we should not only rely on the market dip before accumulating Bitcoin but how much funds we have to accumulate Bitcoin because it is the amount of Bitcoin an investor has and how long he continues to hodl that will determine how much profit an investor will have. So the best thing is to accumulate at all time as long the money is readily available and hodl either with the DCA strategy of accumulating Bitcoin, the dip should only be an opportunity or added advantage for an investor to accumulate more Bitcoin and HODL.
Your statement is quite vague. But it sounds like you sound like a bit of a trader.
Investor's investment does not depend on profit. "How long he continues will determine how much profit an investor will make" I would disagree with this phrase. The objective of investing in Bitcoin is of course to make a profit. Duration of investment is not based on profit, it totally depends on an investor's goals. I think the investment period should be more than 4/5 years. There is no best time to deposit bitcoins, you can say the profitable time to deposit bitcoins is when bitcoins dip. At that time you get the chance to buy cheap bitcoins which gives you the opportunity to earn more profit. It's always the best time to buy Bitcoin. Consider the dip time to gain more profit. But one should never wait for the dip time. If you keep buying regularly, you may buy more during dips.