If you follow my recipe, the transpose must be the first thing you do to your data set. Remove any 'promote headers' before this.
If you have succesfully transposed the table, the first two columns will have all the proposed headers (and also null values). You must then select the first two columns and click 'merge columns'. Some of the values in this column will be perfect for you and others won't. Only you can decide. So you perform more transforms as required to get names you want. You then transpose the table again and then promote headers.
If you can't do any of that because it is too complex or not worth the effort then, using your example picture, rename the columns you want to change by hand and remove the first row