You may be interested in this recent working paper (part of the IPUMS working paper series) on this issue of what to do with 2003-2019/2020 ATUS data. The authors’ recommendation is to use WT20 for 2020 and WT06 for 2003-2019. Please note that the paper is currently under review; I encourage you to read it and determine whether or not you agree with the authors’ assessments.