I can easily think of a few reasons:I wonder why January, the series was ready months ago. It probably has to do with marketing.
Can't wait for this!
1. Netflix wanted to see the "reaction" to the first 2 seasons, and it seems it has been off the charts (given that they have renewed the series for a 4th season).
2. Maybe too much going on right now, with the virus, the presidential election, the holidays, etc.
3. Also, January is typically a somewhat "lull" time for TV viewing. The January 8th date seems to be perfect.