imo DCA still works great! You could read this fantastic Kiplinger's post, even with bitcoin nearing 120K, institutional interest and volatility don’t rule out its long-term upside, whatever the price I will recommend staking your idle money monthly basis into bitcoin, instead of letting it decay into your bank account. For anyone in the world who believes in Bitcoin, any day is a good day for DCA, It warns against market timing, DCA smooths out purchasing over all price tip. So yes, if you trust Bitcoin then future is still shiny, DCA will pull out emotion and be apt to accumulate over time, even during the run-up.
Definitely a good way to invest even today, honestly bitcoin still has a good upside compared to other investment assets, that's the point. Many people (including me) say that it is not going to go up like it used to, and that is correct, yes we are not going to get 10x in a year, like we used to could, that's gone. But that is not the point, if you have money to invest, you are going to put that money somewhere, and that means, bitcoin is one option and there are many other options.
You have to ask yourself, what would be the best option to invest right now. Stocks? Which one? Gold? Oil? What are you going to put your money in? I would say bitcoin is still the best one you could make money from if you are smart enough.