Disney resorts run almost full all year long. Especially weekends. And you are talking less than a month away. There are very little last minute reservations at WDW anymore.
There are some cheer competitions & the Arts Festival at Epcot. Plus tour groups on summer vacation from South America. We have gone the end of January/ beginning of February the last 2 years. The parks aren’t empty. We stayed at POR January 29 - February 2, 2018. The food court was packed every morning, no matter what time we went. I mean people were walking around with trays of food looking for a table. These seemed to be families, not tour groups either. We used to stay at POR in the end of August when our kids were younger & we never saw those types of crowds.
So yea, it is normal for Disney resorts to be fully booked for the end of January when you are looking at the beginning of January.