The key to shmiras einayim starts in your mind. If you guard your eyes, but allow your mind to be a hefker, then you are bound to stumble.
You can not dwell on inappropriate thoughts- and if they come up, just ignore, and don’t allow yourself to indulge in letting them fester in your mind. Dont allow inappropriate thoughts to linger. Each time they arise, ignore them, tell yourself that you have to ignore them, and move on.
Additionally:
1) Take your glasses off when you walk outside
2) Learns a few minutes of halachos of shmiras einayim daily- there are a few good books- check local book jewish book store.
3) Install a white filter like yeshiva-net at home.
4) Get an old fashioned cell phone. Have a computer at work and white filter-yeshiva net at home. For calls use an old fashioned cell phone- not a smart phone.
5) Keep Busy- Try to have a morning and night seder- work out if need be. Downtime is the worst thing for shmiras einayim and kedushah.
6) Mechazeik others, that will make you stronger- since nobody likes feeling like a hypocrite.