The Marvelous Mrs. Maisel, the ground-breaking series from Amazon, ended its fourth season with a blast leaving viewers eagerly awaiting for the fifth installment. The narrative of a housewife turned stand-up comedian in the late 1950s and early 1960s New York, continues to unravel as Midge Maisel continues to push societal norms. Here is the explanation of The Marvelous Mrs. Maisel's Season 4 finale and what we might expect from Season 5.

The fourth season finale titled “How Do You Get to Carnegie Hall?” closes with Midge attending Shy Baldwin's concert at the titular venue following her firing.

Bowled over by Shy’s command over the audience, Midge expresses her newfound respect for Shy’s talents. On the other side, Susie, Midge's manager, continues to struggle with her own personal demons.

Midge's professional life took a beating in Season 4. After being dropped from Shy Baldwin's tour for outing his secret in her Miami act and losing her job at the department store, Midge finds herself without any source of income. These events mark a critical turning point in her character development.

Previously, Midge had relied on her privileged background to support her in pursuing stand-up comedy. However, now she is left with no choice but to encounter the harsh realities of life.

Moving onto Susie, she met her personal complications head-on this season. Susie was seen wrestling with her gambling addiction, a significant departure from her usual assertive manager persona to highlight an important theme of vulnerability. This entire scenario made a compelling combination of personal and professional hurdles for both Midge and Susie.

One of the most important aspects of Season 4 is the growth and transformation of the characters.

Midge sees her parents’ marriage crumble, with Rose demanding a divorce from Abe. Meanwhile, Abe is on a journey of self-searching, possibly building a second career as a radical journalist. Their respective journeys are emblematic of how much the characters in this show continue to evolve.

Joel, Midge's ex-husband, is seen productively moving forward in life, while maintaining a soft spot for Midge. His efforts in establishing a club in Chinatown and fathering their children indicate a possible pattern of reconciliation and maturity.

It seems that Joel is starting to find happiness in his accomplishments rather than just playing the supporting role to Midge’s shining career.

Looking at the possibilities for season 5, the narrative can steer anywhere except Midge going back to a content housewife role. She experienced a steep journey this season and her career aspirations will likely remain despite the hardships. Her relationship with her ex-husband Joel could turn into either friendship or a reunion, especially given their lingering feelings.

Susie's gambling addiction can potentially be a dramatic plot twist for the next season, considering how much her clients rely on her.

Her relationship with Sophie, for instance, is already strained and it can worsen upon discovering Susie's shortcomings.

Now that Rose has left Abe, she might be taking a more central role in future seasons. Abe’s career path, however, remains uncertain. He might double down on his new career or fall back to his previous one. 

In conclusion, as fans anticipate what The Marvelous Mrs. Maisel Season 5 will bring, the possibilities remain wide and varied for the key characters. Midge and Susie are expected to continue their bumpy journey in the comedy business, while Joel, Rose, and Abe will continue dealing with their personal and professional turmoil. Regardless of the hurdles and surprises that surely lay ahead, our protagonist Mrs. Maisel has and will continue to stand tall and fight for her dreams, making her journey both marvellous and inspiring for the audience.