I commute also. Strava says about 800 miles so far this year. It’s 2 miles to the office, but I usually add a mile or two to have a ride time of 20 minutes minimum.
I ride a 29" and it works great for me, just fitting in my small rental office. I use a backpack with my computer and lunch in it. I have a water bottle in the rack on my handle. I have a few red flashers on the back - on my helmet, backpack, and unicycle frame. My daughter gave me lights for the wheel, but they are only seen from the side. I have a NiteRider light on the front because my 62-year-old eyes aren’t so good at night. It’s a great, bright light and warns when the battery is getting low. I also have a small white flasher light on the front. At night, I wear a yellow vest with reflective patches on it. Yet, the backpack covers most of it in the rear.
There aren’t any bike paths on my route unless I go out of the way, so I’m on the road with cars. I ride side streets as much as possible to avoid traffic. After seeing many drivers go past me while looking at their phones, I made a change. Recently, I have started riding on the left side, therefore opposing the cars, for much of the ride. That way I can see the cars coming and jump off if they are too close. No, I haven’t had to do that yet, but it gives me peace of mind. Some cars seem to not see me until they are very close. One problem with riding on that side is that cars turning onto the road aren’t looking for a cyclist coming in their lane.
Finally, I occasionally get the car honk that can startle me. I know that most times the driver is just honking to kind of say “Cool”, but for the life of me I can’t figure out why they think it’s a good idea.