This is a good plan. Keep buying and storing BTCs in whatever quantity you can afford. Consider it as a means of saving, not making money, so don’t pay attention to the price.
This is only a good method if you're aiming for long term, if you put your money that you'll be needing soon then it's not a good choice to buy BTC. Cause if you want to a quick flip that you could profit instant then buy and store is not recommendable.