I’m going to offer two points of Archive of Our Own advice right now. I probably have more, but just two need to be said right now.
1. Watch Your Tagging: Try not to tag you fic like you would a tumblr post, like I know it is impulsive to do that, but AO3 tags are really for order/searching only. Tag your tropes, your plot points, your (MAIN) relationship, and any triggers/warnings; but as a interested reader I am not going to scroll through your tags to read your thoughts. I’m actually really glad you're excited about your story and want to scream into the abyss, but that’s why there is an author note’s for before and after the story/chapter. And as a reader, I am more likely to read those with fervor.
Most readers in my experience as a reader, writer, and friend to other readers and writers look for a fic that has Truthful tags about the tropes, couples, and plots they like. Perhaps the greatest longest epic in existence of the fandom has 12 plot tags (some in which they rant, but all relevant to the content within and only one is self commentary), the other 24 are character and relationship tags.
2. WATCH YOUR TAGGING/FILTERING: SERIOUSLY, I’m so tired of scroll past whole pages of fics that have either minute things tagged (i.e. a ship you read about for 5 seconds) or things they just don’t have, but are tagging for exposure. You should not ever have to put a #F/M or #Hetero in your AO3 tags, just click the damn F/M filter tag when publishing your fic. If we see Adoribull show up for a single, 5 second read I’m not going to be upset the tags didn’t tell me.
Don’t get me wrong, if your Secondary/Side pairing is just as prominent as the Main pairing go for it. But an implied, side ship, between two people who see each other once the whole story does not need to be in a tag that others will be scoping out for fics they actually want to read with that pairing.
It kills me how many fics have all the category (aka: relationship) tags checked on it, while the only pairing in the whole story is (MN) and not (YZ or FU).
I get the whole exposure aspect and all that, but honestly it makes searching a mess, I will hate you, and probably never read any of your fics because 🖕
tldr; I’m a salty reader/writer tired of seeing a fic in every tag not because you managed to hit all the good stuff, but because your trying to self-promote in/using tags. And it doesn’t make me want to read your story ever.