You can buy a suede stone and just gently rub the toe of the boot. That should lighten the toe a bit. I used it on our leather couch to take out dark stains and it really worked remarkably well. Just test in on a little area first.
< member since 2006 (no idea where 1969 came from ).

Medium/high porosity; color treated; medium density; medium; 2c/3a; chin length.
Daily co-wash, condition, leave-in & stylers = Aubrey Organics GBP Conditioner; Curl Junkie BeautiCurls Argan & Olive Oil Conditioner; CJ Curl Assurance Smoothing Lotion, CJ Coffee-Coco Curl Creme Lite & CJ Curl Queen