I agree that this board is the best place to ask this question and search for additional information.
I have stayed at all level of resorts on my four (hopefully soon to be five) solo trips. I don’t know what your budget is, but one piece of advice is to not stay at a less expensive resort because it’s just you. If you want to stay at a less expensive resort or a more expensive resort isn’t in your budget, you’ll be fine. However, I wouldn’t let price be the only consideration if it doesn’t have to be.
One issue a lot of solo travelers seem to have is the fear of dining alone. This isn’t something that bothers me. I can tell you that no one really pays attention to you because they are too wrapped up in their own lives. A lot of people recommend dining at the bar at the restaurants that have them. I personally prefer a table, but if you want to socialize while eating, the bar might be your better choice. If you’re uncomfortable just sitting there, pull out your phone and read, catch up on social media, play games, etc. Also, if dining alone makes you uncomfortable, try it a few times at home before your trip to get used to it.
Presumably you aren’t renting a car. Before DME, I used either town car transportation or a Mears shuttle. I actually preferred the shuttle; I had a bad experience with one of the town car companies. Once DME is gone, I’ll probably use the Mears replacement for DME. I know a lot of people like to use Uber or Lyft, but I haven’t done this myself.
I can’t really say anything negative about going to WDW solo. In this day and age, it’s not like you are really away from friends and family since you can call, text, video chat, and so on. The best part is that you can do what you want, when you want. You can make as many or as few plans as you want and change them on the fly. You don’t have to make anyone else happy.