for me, part of my strategy is remaining organized and eliminating anything that may impede the songwriting process. that and being intentional about carving out time for writing, any time that i can - even if that amount of time only amounts to 5-10 mins at a time.
for one, i have a half-hour commute to/from work via rail, so much of my writing happens on the train.
i have all my music programs installed on my work computer - BGB w/ LSDJ, schism tracker, famitracker, audacity, EMS cart drivers, SAV management utils, etc., so that i can fire it up when i have short breaks. even if i have 5 minutes to mess around, that's enough time to at least start a new musical idea.
i now have much of that work synced through Google Drive so that i can save my work to the cloud automatically and continue it at home, or vice versa, with no fuss.
one more thing, i know this may be a luxury for some, but try to promise yourself that you won't work for more than X # of hours a week. this is more of a general time/resource management thing at work but the greater the effort you make to not let your work bleed into the other parts of your life, the more incentive you have to write when you've gone through all the trouble of getting the time to do so.