2) - Buy small amounts at a time , we are buying at 19k , 16 k , 14k , 12k , 10.1k , 7.25k wherever it goes we keep buying . This is how big financial funds and big traders are averaging their buy
DCA is what you are explaining and that is the best way to btc instead of waiting for what is "perceived" as the right time or buttom because that may never be known before bitcoin price go bull again. Therefore to gradually accumulate is a wise hodling decision.
3) Go for long term investment , ask yourself : what will be bitcoin price in 5 years from now ? Going to zero ? Going to 250k ? stay at same price ?
Longtime investment as to 5 years is for loose money not money you plan to use in as soon as possible. This means that you have to set that money out for investment lasting you a long time so that even with fallei price you are not worried because it will go back up to your area of cash out.