efiling and online prep are closed. you must either buy the CD version (make sure your computer has a CD drive) or a download version. the return must be printed and mailed.
You missed the October 15 deadline to start a new online return. Now you need to purchase desktop software and install/download it to a full PC or Mac--not a mobile device. You can purchase it from TurboTax or from various retailers such as Amazon, Costco, Walmart, Best Buy, Staples, etc.
If you want to file for free you can fill out the forms by hand. Here are some basic forms.....
Here is the 2019 1040 return
or if you want bigger type use 1040SR for Seniors,
2019 Instructions https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
2019 EIC and Tax Tables https://www.irs.gov/pub/irs-pdf/i1040tt.pdf
2019 Schedules 1-3