In addition to lots of foot care work -see MWOD videos for their foot care videos – you will need a subscription:

http://www.mobilitywod.com/daily/tuesday-february-4th-2014/
http://www.mobilitywod.com/2014/01/pro-episode-59-reclaiming-those-gnarly-feet/
http://www.mobilitywod.com/daily/sunday-april-13th-2014/
http://www.mobilitywod.com/daily/saturday-august-9th-2014/
http://www.mobilitywod.com/daily/friday-april-3rd-2015/
http://www.mobilitywod.com/2013/05/the-flat-feet–solution/

http://www.mobilitywod.com/2010/08/episode-07-bro-your-navicular-bone-dropped/

I would also try Correct Toes: https://nwfootankle.com/products/10-correct-toes/grid

they are a cheap solution and i wore them only at night during sleep, and when i walked barefoot around the house.

the other thing to do is to find shoes which do not mash your toes together, which unfortunately are 99% of the shoes out there. check out the nwfootankle.com site for recommendations of brands. the more your feet are mashed together, the more Morton’s presents itself.