accessory help 😅

I recently bought my first e-bike and I love how zoomy and fast it is! I sold my car to buy it and primarily use it to commute to work, so there’s lots of car traffic and my town doesn’t have great bike lanes and I’ve nearly fallen a few times when I’ve been crowded off my path. I’m wondering if anyone can recommend any of the following

• turn lights: something bright and obvious, even during the day
• mirrors (I’m a little concerned about how much handlebar space they take up)
• not a safety measure but can anyone recommend a good seat? I’m not skinny so something comfortable but not too squishy; I want good support

happy to hear any other useful extras anyone might suggest!