Although this question is not directed at me, I am interested in answering this question, especially since I also do the DCA strategy that I do every week.
Before getting into the first question, I will say that in this strategy we need consistency and I think that also includes the amount of money we allocate each week, although I prefer to be more flexible, I mean when we have more money why don't we allocate the extra money? (provided that the money is really money that is not intended for other things.

If I have the money you mentioned, let's say $100k. That money is enough to buy approximately 3.5 bitcoins if converted at the current price. I have plans to buy at 3, 4 or 5 purchases, and it is situational. I will buy now with the amount of 1 bitcoin, I have a plan like this because I still see bitcoin still has the potential to go back down. And if the price goes back down I will buy another 1 or even more bitcoins.