Idk 'bout drama levels, but here are some of my favorite shoujo ai/yuri:
https://www.mangago.me/read-manga/lily_marble/
https://www.mangago.me/read-manga/dallaeya/
https://www.mangago.me/read-manga/umineko_sou_days/
https://www.mangago.me/read-manga/hate_me/
https://www.mangago.me/read-manga/chouchou_nannan/
https://www.mangago.me/read-manga/partition/
https://www.mangago.me/read-manga/run_away_with_me_girl/
https://www.mangago.me/read-manga/tsukarekitta_onna_ga_shinuhodo_iyasareru_tame_ni/
https://www.mangago.me/read-manga/rock_it_girl/
https://www.mangago.me/read-manga/i_love_you_so_much_i_hate_you/
https://www.mangago.me/read-manga/blooming_sequence/
They all have happy endings, and even if there is some drama it's just in normal amounts for romantic manga, i think ╮(￣▽￣)╭ I hope you find something you like!
i need yuri reccs that dont inlove to much drama completed if not them ill do ongoing as well