Impressive! I'm struggling to hit the 3,000 mi mark on my Vado SL's upcoming 1st anniversary. You're averaging over twice that!
Jeremy, you and I have a similar situation. Not that I care about the overall mileage, but I will roll over 3K this month (if I can fix my brakes, that is!

) after 1.5 years on Fättie! Loving every minute!
… other than good use practices. ...
I would make a couple of addenda to Phoenix’s comment. I think it’s really important to service brakes (particularly on a 50+lb. ebike) depending on usage. I see a few folks around here who grind their disc pads down to the metal and I cringe a little bit. Arguably, servicing brakes is “good use practice” in Phoenix’s parlance, but I would call it out as important for an ebike and particularly heavy ones.
Secondly, I would argue that sealing treatments for your electronics (as in water/dirt/salt protection), whatever that entails for your ebike, are very important. It depends a bit on what kind of conditions you ride in, but I’ve learned the hard way (first hand, that is) that road conditions (especially in winter) can cause all kinds of problems for an ebike. Of particular concern, re: safety, is your battery. Make sure there is no open area(s) for schmutz to get in. Make sure any sealed connectors are properly seated. And, or course, find a good place to charge and store your battery. I use my fireplace in my house, as one example. But, the need to keep things sealed and dry also applies to the rest of the electronics, which can get ruined relatively easily.