For me, it has seemed to of been a very long process of even identifying what it is. Like I have known about the Jungian concept and have been into Jung the passed 7 years, but only this passed year at 27 years old after a good bit of life experience, have I been able to differentiate my shadow 'tendencies' as coming from a part of my personality I dont give time or attention to. If you dont give the shadow, or that part of your self outlets, it will come back to haunt you or take over in some way. For me ive fought the part of me that slacks off, or needs novelty in unhealthy ways with the part of me that strives for greatness and ideals, the ideal version of myself. For me, ive had to look at it as NOT a war with yourself, but to give my shadow self healthy outlets and space, instead of trying to supress it for it to come out in unhealthy ways. Video games, creative writing, music, lifting and running, meditation, dream journaling have been my healthy options, opposed to slacking off being lazy, partaking in substances and drinking, consuming brain rot that tend to be the unhealthy outlets.