Yes this is a good idea. If anyone new to bitcoin or want to grow investment using Dollar Cost Average DCAmethod is good move. It help to buy bitcoin slowly without worrying about its price going up or down. Invest fixed amount regularly which makes it easy and low risk. This method is good for beginners because it help them to build their investment. Other ways of buy bitcoin like waiting for dip or investing much at once may not be good for new investors because they require lot of money and it can be risky too. Another option is Hyper DCA but it is need stead income and long term plan. Most important thing to keep in mind is that holding bitcoin is best way to increase investment and trading can lead us to losses.