I am watching with great interest, that said, there arent many, and i suffer from "ive already read them all" disease. so, if you're one of the lucky few who haven't, take this:
https://www.mangago.me/read-manga/summoning_a_bl_fan_to_another_world/
https://www.mangago.me/read-manga/stuck_in_my_sister_s_dating_sim/
https://www.mangago.me/read-manga/shouwaru_boukun_kishu_to_nagasare_senba/
The covers weird but its normal i swear. ^^^
https://www.mangago.me/read-manga/i_became_the_lousy_side_top_official/
https://www.mangago.me/read-manga/i_have_to_be_a_great_villain/
this one is... alright? its good actually, just, a slowburn ^^^
https://www.mangago.me/read-manga/omega_ni_dake_wa_naritakunai_isekai_tensei_shitara_ane_no_bl_manga_no_nakadeshita/
not many chapters out, but the closest to a traditional isekai.
https://www.mangago.me/read-manga/highschool_boys_trapped_in_a_fantasy_world/
and finallyyy...
https://www.mangago.me/read-manga/dear_sister_i_ve_become_a_blessed_maiden/
though im sure you've read this one.
if you want, here's my personal list.
https://www.mangago.me/home/mangalist/2350685/
Mine. Not sure it qualifies as a proper isekai but it is my favorite. https://www.mangago.me/read-manga/to_be_or_not_to_be/
https://www.mangago.me/read-manga/the_affairs_of_the_other_world_depend_on_the_corporate_slave/
https://www.mangago.me/read-manga/sweetie_sweetie_sweetie/
https://www.mangago.me/read-manga/the_fallen_duke_the_knight_who_hated_him/
The last one I think was uuh second life kind of thing but it's really good so read it
Rec your fav bl/gl isekai pleaseヾ(☆▽☆)