E-bike with an upright riding posture

Hi friends,
I’m looking for an E-bike with an upright riding posture. I want something with more than a 500-watt battery. I also need a bike that would be enough to support my 230 pounds, 5’ 8” structure. For now, I’m riding my existing bike pretty regularly 20 to 40 miles, 4 to 5 times a week. The area where I live is a bit hilly. Can anyone over here suggest me which E-bike would be suitable for me? Would a bionx electric bike be a good option? Please do share your suggestions. I am eagerly waiting for your replies.