Well I'll be, all these posters saying that Katman is right????????? Almost too good to be true.
But he's right and you've done well to get this far and I'd say that's mostly due to your age and your instincts for self preservation.
Nothing at all wrong with a good old Suzuki 1400 cruiser and as you've ridden it for some time now I'd bet you'll continue to do so with ease and a degree of comfort.
ACC courses, mentors all good ideas and well worth doing.
Track days? well a bit of fun but provide not much more than an excuse to get out on a race track and go faster than you've ever gone before.
Training day at a track, a worthy endeavour and with the added bonus that you will get a go at a bit of a fast lap sometime during the day.
Enjoy that bike, they're good equipment and reliable as hell.