1. Malvolio's Revenge: Malvolio, who had been tricked and humiliated by Sir Toby Belch and his companions, seeks revenge. He writes a letter to Olivia accusing her of being in love with him, leading her to confront Malvolio and reveal the prank played on him.
2. Resolution of the Love Triangle: The love triangle involving Viola (disguised as Cesario), Orsino, and Olivia is finally resolved. Viola reveals her true identity to Orsino, who finally realizes his love for her. Olivia, having fallen in love with Viola while she was disguised as Cesario, also accepts Viola's true identity and agrees to marry her.
3. Sebastian's Return: Sebastian, Viola's twin brother who was presumed dead, returns to Illyria. This leads to a joyous reunion between the twins, further solidifying the resolution of the play's conflicts.
4. Marriages and Unions: The play concludes with multiple marriages and unions. Viola marries Orsino, Olivia marries Sebastian, and Sir Andrew Aguecheek becomes engaged to Maria. These unions create a sense of harmony and happiness, resolving the comedic misunderstandings and conflicts that characterized much of the play.
5. Punishment of Sir Toby and his Companions: Sir Toby Belch and his companions, who had been responsible for the pranks and mischief throughout the play, are ultimately punished. They are reprimanded by Olivia for their actions, and Sir Toby is forced to apologize to Malvolio.
The conclusion of Twelfth Night brings a sense of order, resolution, and joy, as the various plotlines and conflicts are resolved, leading to a satisfying and comedic ending.