An individual trader and investor is almost a member. For example, if sand and silt are placed in the same container, the sand will absorb the water.Alternative investing is like water and trading is like sand. A person will absorb two target trade investments and end up exhausted where your losses will be more. So go long the investment in DCA method not trade.
if you want to be successful with your investment, it's best to take out any form of urge that compels you to consider trading part of your Bitcoin for whatever profit you anticipate getting. It's not as if all traders always make loss and it will be biased and too sentimental to think so, they might get lucky and get some profit with it but it's never worth the effort that after you've set out strategies in place to help you buy Bitcoin now that it's still convininece to doing so that you now try to trade some of your Bitcoin holding and end up diminishing them along the way should things go wrong.
Your analogy about investing and at the same time trading ones Bitcoin being the same as of mixing sand and water in a containner is good but to better potray how risky trading part of Bitcon is, when you're trading a portion of your Bitcoin stack, it's just like you're intentionally pouring impurity into an already cleaned water you've carefully sieved out which goes to contaminate the whole mixture of water. Chances are that if you ever trade your Bitcoin and you experience loss in the process, you will get tempted to trade again to recover the one you've lost and then do it again and if you're not careful enough, you're endangering your Bitcoin stack to never growing and potentially diminishing with time.
As a Bitcoin investor, one shouldn't be involving themselves in an activity that could make them lose part of what, if not all they've been trying to build for months or years in one day, all in the name of adding to their portfolio through whatever strategy, I know their are people who still got that mentality but I'm not in support of it and won't advice anyone to thread that part, trading is risky and sometimes cause those who participate in it to become greedy and we all know that once greed comes in, sometimes the trader stands more chances of losing more than they could even profit. What some investors don't understand is that the goal is to built their portfolio over time by buying and hodling for long-term then accumulate more on different intervals with better strategies and not trying to add to your portfolio by risking your coins in something that's not certain. I'm not against traders though, anyone can do whatever they like with their coins but I won't advice investors to thread that part since their are better ways they could accumulate more Bitcoins to their Portfolio.