So, I intentionally refrained from recommending any specific works for "novel perspective", and I'll hold to that: There are just too many different angles for me to cover, my recommendations would be relatively low-quality in many places because I'm not an expert in all domains, and there's no real way for me to provide anything like a "primer" because the entire
point is to get hyper-specific rather than easing people into things or starting with general coverage. If you're looking for novel perspectives, just keep digging. The key is that you probably won't find much that's particularly unusual in the top-rated lists because the top-rated lists filter for mass appeal in the same way that mass market paperback publishing does. As a specific example, Royal Road's community is infamous for leaving bigoted one-star reviews on anything with queer characters. Instead, you'll want to move sideways through things like AO3's tagging system and the shout-outs that RR authors put in their after-chapter notes.
For general introductions to amateur fiction and fanfiction, though, though, I'm happy to share my starter recommendations. These are just plain good fiction. You can find a lot of other good works starting from these.
* Xenoethnography (https://archiveofourown.org/series/913458): Optimus Prime, realizing that there are people whose job is facilitating cultural understanding, hires an ethnographer to live among the refugee Transformers and document their culture. Familiarity with Transformers not required. This one probably is a pretty good work for the refugee/immigrant perspective.
* Katalepsis (https://katalepsis.net/): A serial web novel about cosmic horror and human fragility, urban fantasy and lesbian romance.
* Super Supportive (https://www.royalroad.com/fiction/63759/super-supportive): Hopeful, sometimes cozy sometimes harrowing commentary on trauma, colonialism, sacrifice, and self-actualization. It takes its time about it, but IMO it's worth it.
* To The Stars (https://archiveofourown.org/works/777002/chapters/1461984): Old Man's War, guest starring Iain Banks and Greg Egan... as a Puella Magi Madoka Magica fanfic. It's shockingly deep and twisty. You do ~need to watch PMMM first, but that's absolutely stellar too, and I have no reservations recommending both.
* Divided Loyalties (https://forums.sufficientvelocity.com/threads/warhammer-fant...): Swords-and-sorcery diplomatic intrigue with a heavy helping of worldbuilding. Familiarity with WHF not required.
* Bioshifter (https://www.royalroad.com/fiction/59450/bioshifter/chapter/1...): A story about love, self-acceptance, neurodivergency, and a whole lot of trauma. Seriously, it's extremely good, but also super rough to read.
* Lieutenant Fusilier in the Farthest Reaches (https://forums.sufficientvelocity.com/threads/lieutenant-fus...): Lesbian war robot questions her purpose while coping with the fact that the humans keep themselves busy in the post-scarcity space-future by cosplaying as victorian english nobles.
* The Commonweal, starting with The March North, by Graydon Saunders (https://dubiousprospects.blogspot.com/2018/09/where-to-get-m...): How to build a good place to live when physics hates you and every other polity is an expansionist totalitarian sorcerer-kingdom, featuring radical egalitarianism, military ethics, and eldritch spider granny weatherwax. The least amateur thing here, but I'm pretty sure still traditionally unpublishable - the text is aggressively dense and elliptical.