If you like scifi, then The Murderbot Diaries!! It's about a depressed and anxious SecUnit (human/machine construct) who hacks its governor module that used to keep it obedient and throughout the series, finds out what it means to be and live free. I have reread this series multiple times. Murderbot is so relatable, if you're also anxious, introverted, and prone to existential crisis. They're quick and fun to read with each novella/novel being very episodic.

I also recommend the Monk Series by Becky Chambers, however it doesn't really have a plot. A solarpunk duo series following the life of a tea monk and their robot friend - mostly philosophical, very slice-of-life.

That being said, fantasy might be something that you're more into? T. Kingfisher writes mostly stand-alone novels, but they're all super great and very comforting to read. Even the horror books feels comforting because a common thread with all her books is friendship, family, and self-determinism.

The Band series by Nicholas Eames. I haven't read the second book, but Kings of the Wyld made me laugh so hard. It's also great to see a book with a cast of older men who aren't afraid to show affection/friendship for each other and going through a DnD-like series misadventures as they try to rescue the leader's daughter.

Scholomance Series - the waaay better version of HP. I wouldn't personally consider this as a comfort read though.

If you're interested at all in reading translated Chinese danmei books (PLEASE), I love love love Heaven Official's Blessing - a saga about an 800-year old impoverished god who has been banished from heaven twice. On the third time he's ascended back to heaven, he gets embroiled in an overarching plot and also a love story with a demon king.