Methods:
1. You can go to the ranking and search the 'collection' and 'all time' filter, choose those two, and the top 100 fics have a very high chance of matching your taste and being well written.
2. Search accounts with over 2k hours, and see if they have a book collection and go check their collection, e.g you can check mine.
3. Check the account of people who write detailed reviews that you, on your own judgement, think is fair. And check their moments where they comment, usually you will find books that will match your taste.
4: You can kind of get the feeling if a fic is gonna be great or be absolutely trash just by reading their title most of the time.
Finally 5: This one requires some effort, if you go to a hastag# and want to read a good fic, try to differentiate the covers, because most of the covers of the books I personally considered well written have a unique book cover, e.g meta essence. And most of the the trash fics' cover look like it's ai generated or are using 'sexy' pics to gather attention.