As you probably know, it’s best to turn to transits, including lunations and eclipses, progressions and directions for timing of events. But, you can time events in solar returns too.
I had an interesting astrological consultation recently. Interesting and somewhat perplexing because the client’s solar return (SR) Sun is in the 12th house and it has been one of her best years ever. Now, that’s a new one for me. Unless you apply an orb of 8° for conjunction, which I feel is too wide for me.
I think it’s more likely for a person to change jobs during progressed disseminating lunar phase and potentially for a person to change career during progressed last quarter phase. If there is no change of career, I believe that the person could feel an urge or impetus to restructure his/her job nevertheless.