First of all engaging in trading and also investing or trying to invest is not advisable or encouraged since that person already have the mindset of short term profit ( which trading ), there is a possibility that he will use his Investment to trade one day because trading is like a character once you have this character it becomes hard to stay away from. So these two combo can not work, just pick one and focus on but I will still advise one go for Investing instead of trading because it is very risky. Your last statement seems to look misleading, mind you Bitcoin is not a cryptocurrency rather it is digital asset which has potential more than those cryptocurrency.
I don't really think that way though because I know of some few individuals that were traders, but due to constant losses they finally realized that investment in bit is the best, they till venture into the market, but they aren't as obsessed as they were when focusing on trading alone.
Additionally , they now do it like something they wish to try their luck, even though their main focus is in Bitcoin investment, so I believe that both of them can be done without troubles as long as he prioritize Bitcoin investment over trading.