Hey there, hi there, ho there Tammy! I am really glad you are starting to plan well in advance of your Walt Disney World Resort trip. When trying to pick out a time period that is practically perfect in every way, I always first consider common school breaks - if the kids are out of school, the theme parks are likely to be a bit busier. Martin Luther King, Jr. Day is January 20, 2020, and in my experience, the few days before and after this are quite busy. I know of some big sports-related events in the area that will have some impact on crowd levels in the parks: Pro Bowl on January 26, Super Bowl in Miami on February 2, a high school dance competition February 1-3, and a high school cheer competition February 8-10. I really feel like all of the weeks you mentioned may end up being comparable with low to moderate level crowds, so I recommend you consider what will work out best for your family and make those most of it!
The best way to make the most of your days at Walt Disney World Resort is to go in with a plan. Pick out what park you will visit each day and make dining reservations (up to 180 days in advance) and FastPass+ selections (up to 60 days in advance of your check-in date for those staying at a Resort hotel, 30 days if staying off-property). Also, if you are staying at a Resort hotel, consider heading to the park hosting
Extra Magic Hours on some of your days. If you are not eligible to attend those, then make sure you plan to head elsewhere each day. Arriving early in the day is always my favorite planning tip. We get to the parks at least 30-45 minutes before opening so we can get a jump on our favorite attractions with as little of a wait as possible. When we utilize these tips, then we have fantastic days in the parks, no matter the crowd level.
I hope this helps you get started with your planning! Please let us know if you have any other questions!
Brandy