However, when using a long-term DCA approach, I’ve found that returns alone don’t
say much about whether the strategy is actually viable to follow over multiple
market cycles.
That's on you but to me, it has worked and very profitable. I guess it also depends how much you're holding and how long you did.
For those here who have used DCA or similar long-term approaches:
what do you personally look at to judge whether a strategy is still working
and worth sticking with?
The choice of what you hold.
Many think that DCAing alone is a good strategy which is true but, if you ask them what they've been DCAing, they'd say some meme coin or unknown cryptos.
And that's a huge mistake that they have been consistent with. Look at it if you've been doing it with bitcoin, you've never go wrong by doing that strategy to BTC.