Do you have any recommendations that’s like Regas? I’m really hooked on their story no...

This is very similar in character design and art https://www.mangago.zone/read-manga/pfeos/

Also, try these:
https://www.mangago.zone/read-manga/spinel_baekji/

https://www.mangago.zone/read-manga/the_place_where_the_wind_blows/

https://www.mangago.zone/read-manga/smyrna_capri/

https://www.mangago.zone/read-manga/two_empires_the_slave_of_the_empire/

https://www.mangago.zone/read-manga/tale_of_the_yellow_dragon/

https://www.mangago.zone/read-manga/the_trapped_beast/

Thank you so much! (=・ω・=)