The best approach to accumulate Bitcoin in my own opinion is to just buy once your discretionary income is available, and just keeps on buying weekly or monthly according to how much you can do away with for a very long period of time, if in the process of accumulating then their is a dip in the market, you might decide to buy aggressively only if you have the financial leverage to do so
Surely ongoingly buying of bitcoin is always the best approach for bitcoin accumulation this process make it very easier for those guys who are yet to build up their discretionary fund so they won't be engaging themselves into buying aggressively they can only focus in ongoingly buying of bitcoin at same time building their discretionary fund to the point when they can start applying some aggressiveness. However, an investor must not be aggressive only when there's a dip in the market is also good to apply some aggressiveness when the market is still appreciating since we are investing for long term. I believe at time goes on it will keep compounding.