The steepest decline in employment opportunities has been in non-essential jobs, especially those that pay less than $35,000 per year. 

Change in weekly job postings by occupational category and median annual earnings
Source: PolicyLink/PERE analysis of data from the 2018 5-year American Community Survey microdata from IPUMS USA and Burning Glass Technologies. Note: Universe includes the employed civilian noninstitutional population age 16 or older in occupations with valid data on weekly job openings between 3/2/2020 and 4/13/2020. See methodology for details. Get the data