Buying little by little on the way down is one of the best strategies out there. No-one ever knows where the bottom might be. And then once it starts rallying again, if you're still not fully positioned, you can nibble on the rebound too. As you say, scaling in when everything is bleak, and scaling out when everything is rosy, is a very good way to help insure you always end up on the winning side.
For what it's worth, I expect at least one more big exponential move higher, that proportionately exceeds the former to the same degree it proportionately exceeded its predecessor. But remember, that's just one person's opinion. 😉