First year filing single (recent widow) & computing quarterly Self-Employment installments

My husband died in 2022 so this will be the first year I file as a single person. I am over 65 and am sole proprietor for my own business. I am concerned about the loss of the married filing jointly deduction and unsure how to compute my self-employment quarterly installments. My income is about 1/3 Social Security, 2/3 self-employment. I appreciate any advice on offer.