Dainana Ouji ni Umareta kedo, Nani Surya Ii no?
I Was Born as the Seventh Prince, What Should I Do?

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The protagonist is reborn beginning a new life as a baby/infant, attaining a new physical body and identity in the world. Includes Passage of Time, Age Progression, Second Chance, Reincarnation tag.

(PART 2) https://myanimelist.net/stacks/55156

Second Chance from a Bad Ending in Fantasy Setting
https://myanimelist.net/stacks/36912
Protagonist aims to protect lead character from bad endings in romance/fantasy
https://myanimelist.net/stacks/37175
The side character is the Regressor/Isekai, the protagonist is not.
https://myanimelist.net/stacks/45493

Country Building/Conquest/Seige in fantasy/isekai
https://myanimelist.net/stacks/37268

The protagonist is either a Servant(Maid, Butler, etc), Royalty(Princess, Prince, etc), or a Saintess/Saint in a Fantasy/Isekai setting. The protagonist are one of these roles, or will be declared as one of these roles in the future.

(PART 2) https://myanimelist.net/stacks/48221
(PART 3) https://myanimelist.net/stacks/49339
(PART 4) https://myanimelist.net/stacks/56195

Child protagonist with aristocratic authority in fantasy/isekai
https://myanimelist.net/stacks/37605
A protagonist with aristocratic authority in Fantasy/Isekai
https://myanimelist.net/stacks/38376
Protagonist was thrown into a Novel/Book world
https://myanimelist.net/stacks/37920

Country Building/Conquest/Seige in fantasy/isekai
https://myanimelist.net/stacks/37268
Healer/Medicine in Fantasy/Isekai
https://myanimelist.net/stacks/48313