With time my interest is only limited to Bitcoin despite the fact there are many alt coins with attractive features and cheap prices. You have done right move of accumulating Bitcoin in DCA manner. Most of us don't have huge capital to invest in Bitcoin, for such people DCA is best strategy. Also those who are new to Bitcoin should not invest all money at one price. First one must understand the market and then decide how you will gather Bitcoin.
Between I am also an investor who follow DCA.
Whether to limit yourself only to Bitcoin or not is an individual choice for everyone, with proper handling of altcoins, they will also bring good profits, and no less than Bitcoin, only in the case of altcoins, you should definitely remember that they need to be sold. Unlike Bitcoin, which can be hоld for many years, doing the same with altcoins can be very dangerous. I would definitely not risk hold altcoins for several cycles.