New to eBikes - where to start?

Hey everyone!

Long-time mountain biker here, but completely new to the eMTB world and feeling a bit overwhelmed by all the options. I'm looking to get into some longer trail rides, maybe 20-30 miles with decent elevation, and tackle some technical singletrack that my old analog bike just can't quite manage anymore. For those of you who've been riding eMTBs for a while, what's the absolute first thing you'd recommend a newbie focuses on when looking to buy their first electric mountain bike? Is it motor type, battery size, suspension travel, or something else entirely? Any advice is super appreciated!