Bitcoin is an asset that appreciates over time, so any strategy, whether Lump sum or DCA will yield a profit if held long enough. But in my opinion, DCA is safer and can deliver significantly better return, and is suitable for all investors.
Lump sums are only suitable for those with experience, substantial capital, and a willingness to accept significant risk. Because choosing the wrong time to buy can cost us dearly. Similarly, those who went all in when Bitcoin reached $126k will take years to recoup their investment, let alone make a significant profit.
It's not pure saying and we can verify it with Bitcoin market history, its ROI over past years, and some websites for checking things like Bitcoin profitable days, Hold.camp for likely holding time for profit.
I list these sites below, everyon can visit them and check for more details. Generally, Bitcoin has very good ROIs over past years and most of people holding days are profitable days.
https://hodl.camp/https://www.bitcoinmagazinepro.com/charts/bitcoin-profitable-days/https://cryptorank.io/price/bitcoin/analyticsBitcoin & traditional assets ROI:
https://casebitcoin.com/DCA Bitcoin for accumulating more coins, and having bigger Bitcoin portfolio as well as enjoying more profitable days.
https://costavg.com/