Buying every dip between -2% to -8% is a good choice if you want to accumulate. Of course, it's still a good idea to do DCA rather than all at once - but the best option of course depends on the amount of budget you have. If you have $50 in your account and at that time the price of bitcoin falls by -7% - then don't do DCA, but buy it lump sum.
I keep regressing on what you said, of course a decline in price of - 2% to - 8% is good enough to accumulate Bitcoin. I would speak on my own understanding, it depends on the price at which the price drops, we should be able to differentiate when Bitcoin is being volatile and when experiencing a dip. So we can know when to apply our strategies, for maximum profits.
There is nothing like maximum profit in bitcoin, the only way you can get good amount of profit is by investing in a long term, using DCA strategy to buy weekly or monthly irrespective of the price of bitcoin at that moment to reach your bitcoin target as long as you have your emergency funds available and you have taken care of other expenses. This is where you can enjoy the compounding profit because for every circle, you profit will compound based on the size of your portfolio. So if an investor understand this and hodli with regular buying for let's say 8-16yrs. If investor A invested a certain amount in bitcoin for 8yrs, his profit will be smaller compare to investor B that could invest same amount for 8yrs and hodli for 16yrs, even if he didn't buy during the additional period of eight years.
There's no point buying with DCA if you have a low budget - say $50, I mean the bitcoins you get won't be significant. So consider decisions wisely and be wise in making decisions even if you are not good at analyzing.
Who on earth would want to set a budget of such a little amount, those who invest this little are those who always wait to buy the DIP but those Dcaing will need to invest large amount cause they keep buying at different prices, bit by bit base on the budget they have in mind.
Why do you make it look as if it is only people that have $100 as extra money to invest in bitcoin can do that weekly or monthly. DCA method is open for everyone to adopt, all that matters is that you shouldn't use the amount that will affect your monthly expenses or that will be a burden to you to invest. If you can use $50 or $20 or $10 to buy weekly or monthly, it doesn't matter as long as you are consistent with buying regular, gradually, your portfolio will grow. It is lump sum that needs a reasonable amount of money and not DCA. It is better to be a lower coiner, than a no coiner because you have less than $100 to invest. No amount is too small, it is better to get started early with small amount than waiting to start in a bigger way that you don't know when.