If you started your DCA when BTC was at $68000 and continued it till now you would be in negative territory and new investors make get scared and give up watching so much red in their portfolio.

This is where DCA works but you said it right, its not a short term strategy and you need to put emotions aside and invest. Suppose if you bought at $68,000 then buy at $50,000 then $40,000 or whatever value until it reaches bottom. Your average buying will then not be at $68,000 but it will be much lower and once the market starts to recover or even the BTC reach $68,000 you will be in profit :)