There may be several more 100% gains to come, so don't feel like you lost your opportunity.  I recommend spending a fixed dollar/euro/yen amount every week, ignoring price. This works well for most people, if they persist.

The main thing to learn from your case is that you don't benefit from xmr you don't hold.  All the many hours I have spent trading were of insignificant  value compared to just being there, bags full, when the moves come.