Good 2D animation software for the kind of results you indicated include Toon Boom Studio and Anime Studio Pro, which I’ve been working with here.
Results depend more on your animator than the software – it’s not the use of Word or Final Draft that leads to a great story – though fit-for-purpose software makes the task much easier. John Lasseter had a pithy and cutting remark about this relating to wanting to know what brand of pencils the early Disney animators used … https://www.bbc.co.uk/news/technology-21947086
If you have budget, you might be searching for Epipheo-style animators to pitch to you, or if you have the time (months, if you can draw a little already and are good with software) you might be on a learning path with one of the above.