Fix Google Looker Studio Blend for Time-Series Reporting

I need a Looker Studio Data Expert for a small job - I'm trying to blend data from 4 Google Ads accounts to do time series reporting.

I can make the blend work EXCEPT, it won't do any time series reporting, it's only giving me the data for the currently selected month, and the metrics won't give me any comparisons to previous months.

So I'm sure there's something small and simple that I'm doing wrong with this, and this should be an easy fix for someone who knows how.

See screen shot attached for example of the issue.

I don't want to pay by hour for this - please quote me a rate for successful completion of the job. I do a lot of work in Looker so there will likely be ongoing work for the right person.

if you do not directly have experience with data blending in Looker Studio, do not apply as your bid will be ignored.