isekai without romance?

https://www.mangago.zone/read-manga/evolution_begins_with_a_big_tree/
https://www.mangago.zone/read-manga/trash_of_the_count_s_family/
https://www.mangago.zone/read-manga/tensei_shitara_ken_deshita/
https://www.mangago.zone/read-manga/yajin_tensei_karate_survivor_in_another_world/

I cannot recommend more Charlotte's letter. It has an amazing plot, a lot of drama and suspense. Also, the main characters are so likeable and they are the "strong female lead" type of character