When the market goes down, you have to buy more and sell less. I have to sell more and buy less when the market is up. Moreover, during market up and down, you have to make a decision by doing project analysis.
Basically you cannot sell more than bought amounts lol 
. I agree that we may buy more and sell comparatively less but active trading is not about that. This sounds like slow accumulation along with active trading. We take bitcoin as example here (most altcoins are not good for long term holding in my opinion).What would be the differences from buying-at-dips-and-hold to buy-more-sell-less? Both may lead to long term holding and when you sell time to time, you may make use of dips more effectively as you will have capital by selling some and when dips happen then you can go for buying more. So, it seems buying more and selling less along with making use of dips will help effectively for all long term holders.