Decide what kind of trader you want to be and see if it feels natural for you.
If you scalp, like Maurizio said, you can get away with trading the quiet hours. But not everyone feels comfortable with scalping and have a hard time managing the reward:risk.
Otherwise, you have to go longer term, especially if your work offers no flexibility to access charts and your platform during the day.
Are you familiar with support and resistance trading? Because the market seems to be more responsive to these price levels on the longer-term charts, it could be something worth exploring for you.
If you feel comfortable with 100% mechanical trading then it could be worthwhile to explore automating a set of very well tested rules. Be careful with mechanical trading though. In my opinion, it can be just as profitable as discretionary trading but mechanical systems a not capable of adapting to market changes. You would just have to know when the performance of such a system is falling outside the statistical norm (based on your backtesting) and have the discipline to make the changes when necessary.
The point is that there are options for every single kind of trader, full or part time. The work and discipline is required to find and test the rules extensively according to your personality and lifestyle. Once again, it has to feel right and unforced. Hope this helps.