I enjoyed S3 quite a bit, but agree with most that the plot really didn't move much.
There were a few standout episodes. Ep 1 i think had maybe 15 words of dialogue the whole episode. Artistically it was pretty great and I'm sure it will receive a lot of award consideration. Same with Ep 6, which was Tina's backstory.
But, for the most part, this season was all about the characters dealing with and trying to overcome their past traumas. Sydney and her anxiety, Richy and his ex-wife (and her upcoming wedding), Marcus and his mom, Sugar and her mom, and Carmy and basically everyone but especially his former boss and ex gf.
All the while we have the looming tribune review and find out that Cicero has serious money issues that will significantly impact the restaurant's ability to remain open.
But for plot progression, it felt more like the mid-way point in a season instead of the conclusion of one. It's possible S4 comes out faster than a year from now.