It can be difficult to say for sure what any person should do, yet if a person invests similar amounts of value on a regular basis (such as weekly) for 4 years straight, then their average cost per BTC will be right around the 200-WMA - and historically, an overwhelming majority of times, the BTC spot price is at least 25% higher than the 200-WMA.
That's where the success is i.e.
keep investing regardless of how much money you have. It's best to invest whatever you have instead of not investing at all. If you see bitcoin 200 WMA vs spot price then most of time spot price is higher then 200WMA except from Jun 2022 to Oct 2023 where spot price of Bitcoin went below 200WMA. Today Bitcoin spot price is 2x times the 200WMA
https://bitcoindata.science/withdrawal-strategyOf course, there are no guarantees, so any of us who might be attempting to think and act rationally, may well consider that it would be good to invest into bitcoin for a whole 4 -6 years or more and then perhaps to reassess after that. Surely if we are able to frontload our bitcoin investment, then we may well have differing results, yet there are not too many normal people who are easily able to frontload their investment into bitcoin. And, yeah, for sure, each person has to decide for themselves whether and if so how to invest into bitcoin.
Forget about the one who are not easily able to frontload their investment into bitcoin, talk about the one who are willing to invest in Bitcoin. The one who don't have any doubt about Bitcoin that it's price will go high with passage of time should invest in Bitcoin for 5 years at least and if they are not in rush then they might HODL for even longer duration.
Of course, there is some value to keep investing into bitcoin on a regular basis, such as weekly, yet anyone has to attempt to coordinate his amount invested into bitcoin with the amount of discretionary income that he has, and surely if income and/or expenses are erratic or irregular, then there maybe additional challenges to keep the weekly amount invested as regular.
Ability to front load a bitcoin investment might not be common, yet it still can come up from time to time, even for a person who might have had been investing into on a weekly basis for a year or two, such person might have cashflow circumstances in which every once in a while he receives bonus amounts of money or even that he has unexpected amounts of extra money that might come available and then provide opportunities to front load the bitcoin investment, whether he chooses to invest right away with all of the extra money or to set up deferrals by DCA or deferrals by buying on dip that may or may not end up playing out.
From the scenario you cited out, it shows that a bitcoin investor has to have a steady source of income for a healthy bitcoin investment. Its not all about having the initial amount to start with, what if you run into problems that will require you to make withdrawals because there are no other source of income. I hear some people say "borrow to invest" one can only borrow to invest if you already have a guaranteed source of paying back without considering your investment. The fear of missing out on the dip can make an investor borrow in other to take advantage of that opportunity but he should have the capacity to pay back without intervening his investment. The reason I picked DCA above every other strategy is because, it is applicable to all market trend. At pump, dump or sideways one can make investment without considering the market price and will end up with profits if patience is exercised.