Well.. the lump sum buying and just waiting can work, but it tends to make people nervous..
that is why lump sum might be better if it is supplemented with DCA and maybe even buying on dip..
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I've always lump-sum-bought and HoDLed. Except that the lump sums were coming every few months from 2015 onwards. Is that called DCA? I never really looked at the price, fiat never stayed in my hands or the exchange for more than a few days. Market buys only. Has worked out well for me. Average break-even price is under $2k.
I guess I got lucky, going in at the deep dip of 2015. Thank you, Andreas Antonopoulos, that talk of yours that I watched was so enlightening that I did not sleep that night. I had to find a way to buy. And I did. At a local Bitcoin ATM. Great times.
tl;dr: There is no top. Seriously. Buy now. Buy Bitcoin. HoDL.