New to eBikes - where to start?

Hey everyone!

Just picked up my first eBike, a Lectric XP 3.0, and I'm super excited to join the community! I've been riding traditional bikes for years, mostly on paved trails and some light gravel, but the eBike world feels like a whole new adventure. My main question for you seasoned Lectric owners is: what's the first mod or accessory you'd recommend for a newbie, especially for someone planning longer rides (20-30 miles) on mixed terrain? Any must-have tips for a new owner? Thanks in advance!