I always say, it's never too late, until you have 1 Bitcoin. 
And when you have 1 BTC - accumulate more.Having 1 bitcoin is a pretty non-tailored (and perhaps random and not even very realistic) kind of a goal, since people are in all kinds of places in their own life journey, in terms of their various personal financial and other personal circumstances.. .and some folks can reach it easily (and already have reached it), and other folks are never get to 1 BTC, even though maybe they might be able to try or maybe they are able to set some other meaningful goal for themselves that might be more realistic in terms of their own circumstances.
It makes more sense to consider your own timelines and to figure out some accumulation goals that fit within those kinds of goals, and if your are able to reach certain multiples of your yearly income, then you may well be able to sustainably live off of your bitcoin or even to have that bitcoin income to supplement any other income sources that you might have.
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Of course, that's because they knew about the future of bitcoin, which is why they keep accumulating without paying attention to the price. But I think this set of people is very rare, because not everyone that can afford to do that more especially when the value is still very much expensive. Because most people will be scared of losing, I think is just a personal decision. You seem to not know what you are talking about. Bitcoin is still very expensive as compared to what?
Talking about the purchase of bitcoin not being enough, actually I was also thinking the same. is still of recent that I realized that there is no limit in accumulating bitcoin, one is always free to accumulate as much as he can. moreover I think you're right when you said that investing in bitcoin is good when there is a dip in the value, because the price will be somehow affordable during that process.
You seem to be coming to wrong conclusions in regards to whether and/or how to accumulate bitcoin when you are assessing bitcoin as being too expensive. You can do what you like, but it is probably better to focus on accumulating bitcoin rather than waiting for price dips that may or may not happen, especially if you are either a no coiner or you consider yourself to be a low coiner (which means you are still trying to get more bitcoin).
Of course, I'm new to this topic, but it seems to me that if we consider bitcoin as an investment in the long term, then the purchase may be justified, even if the price is high now. But in order not to incur losses, portfolio diversification is important in any case.
If you are new to investing there is no need to start out diversifying.
So if you are new to investing into bitcoin, you can start out by investing in ONLY bitcoin, yet you may well need to figure out your cashflow and your various back up funds, and so back up funds can serve as a form of diversification while you are building up your investment size. ONce you get to a certain size, whether that is one year of your expenses in bitcoin or perhaps even at lower threshold levels than that, then you might start to consider whether diversification might be necessary.. .and not referring to shitcoins, yet considering things like, properties, commodities, equities, cash/cash equivalents... but the point is that newbie investors do not need to be getting distracted into diversification ideas and diluting their finances and/or their focus, when they may well be better using their time and energies to strengthen their cashflow management skills.
Of course, I'm new to this topic, but it seems to me that if we consider bitcoin as an investment in the long term, then the purchase may be justified, even if the price is high now. But in order not to incur losses, portfolio diversification is important in any case.
Portfolio diversification is important when investing, but if you only invest in Bitcoin, I think you only need to focus on buying it repeatedly when you can afford it with a certain amount of money. Because everyone does not need to be afraid to invest in Bitcoin in the long term, especially since the evidence is also quite clear that investing in Bitcoin for the long term can bring more profit than the level of loss that Bitcoin holders are more afraid of. Now you can see for yourself how the Bitcoin price pattern has been since it was first marketed until now and you can also imagine how much profit has been obtained by most people who have invested at that time until now.Portfolio diversification is not important for beginner investors, and they can start out by merely focusing on bitcoin and cash and perhaps diversify over time, if they believe such diversification to be justified in their circumstances. Diversification is no way even close to something that a beginner investor needs to figure out, except to the extent to which the strength (or strengthening of) his cashflow management practices might be considered as a form of serving the purpose of diversification.