If you're still interested in altering the frequency of TM backups, I found a link to TimeMachineScheduler for Mac. I haven't used it myself so I can't say anything from personal experience.

Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365