i see the notion a lot that, after everything azula has done to him, zuko could not possibly ever forgive azula and if she redeems herself she should just make new friends and forge her own path forward. but honestly it's probably the opposite on who could forgive who.
azula teased and humiliated zuko when they were children, tried to trick him into coming home in chains, fought against him when he was branded a traitor, brought zuko home as a hero and gave him advice/listened to his complaining (albeit still often making fun of him), then fought against and tried to kill him after he was declared a traitor again.
zuko never tried to give her any advice or comfort during his time in the FN, exposed her lies to their mutual abuser, betrayed their nation (in her eyes), fought against her during the worst moment of her life when she was clearly suffering a mental breakdown, then canonically threw her in an abusive asylum that worsened her condition, an asylum used to lock up disobedient noble girls. he dragged her out after a year to get information out of her, made her speak again with their abuser, kept her frequently in a straightjacket, dragged her out on a quest to find their mother, and when she lashed out as an individual clearly experiencing a mental breakdown, he dangled her over a cliff and blamed her for their relationship being shit.
yeah, at this point it'd be a disservice to azula's character if she's forced to grovel and plead for HIS forgiveness. they've both tried to kill each other but he's been way worse to her than she ever was to him.
but hey at least that anti who gave the original take got something right, azula should just ditch her brother and get better friends.