Hi Alyssa! There’s no better thing to do than travelling, and as a disabled travel blogger I fully encourage you do so! It’s absolutely possible and worth it!
Nowadays, accessibility is improving everywhere, with more and more places being possible! It’s difficult to define a “most accessible” place, but from my experience Spain (for example Barcelona or Bilbao, but many more cities are great too) is a very accessible country overall. Staying in Europe, Austria (and especially Vienna) is amazing too. If you want something different, Japan might be the most accessible country I’ve ever been. In the US you are doing a pretty good job with the ADA too!
Here’s good to say that you can have a great time also in places that are not fully accessible but offer services and opportunities, like in Greece for example, where I live.
I hope that the above are helpful! Happy to discuss further!