Remote work, based in US but was traveling all last year.

Hello! I work for a center in CO, but due to COVID all of our work is now done online.  Because of this, I was traveling overseas all last year and did not really live in the US during 2021.  I worked for them for half of the year last year as an hourly employee.  All of the work I do is for the US.  I was living in Colorado in 2020 prior to travel, but no longer reside at the address I was living at as I was renting.  I am still registered as a Colorado resident, but was not in Colorado last year as I was traveling.  I believe I will have to file Colorado taxes as that is where I am earning my income (is that correct?), but do I use my old address? My work address? Or is there something else I should be doing?  I am not sure what to do, and just want to make sure I'm doing everything right!