We are spending a fair amount of time testing a debugging weird issues with IE 11. Do you think it is ok to simply drop the support since most of our users are engineers and analytics show pretty much zero IE traffic? Have you faced a similar decision recently?
Then simply reach out on linked-in, introduce yourself, expand on something which you have in common to establish some familiarity and clearly state that you would be interested in some advice/mentoring to achieve your goals. You will likely get a reply that your mentor is too busy for this, but maybe he/she can spare an hour every other month, which would already be plenty and super useful.