I fly about 50hrs / year but within that I have taken 2 steps.
1. I joined Air Search as a pilot. This provides me with challenges that require me to use all of the things I have learned concerning air law, nav, weather, and weight/balance. This stops me simply flying around areas that I know and becoming complacent with modern GPS capability. It also is a very worthwhile charity (here in the UK).
2. Each quarter I schedule a training session to practice all of the emergency and more difficult procedures for helicopter flight. EOL to the ground, hydraulics failure, instrument, last tail, sloping ground, confined areas, limited power land/departures, etc.
This last one I adopted when I reasoned that the likelihood of perfectly executing an emergency procedure in a high-stress "real life" problem when last practiced about a year ago, and before that another year ago, was "nil". In the last 2 years I have had (on different aircraft) a hydraulic failure on departure, and an electrical failure in flight. That extra practice was key - I think - in remaining calm and simply flying the aircraft, whilst as a secondary tast dealing with the systems problem. As a result both turned out to be "non-events" in terms of "excitement".