2-dome no Jinsei, to Omottara, Jitsu wa 3-dome Datta. Rekishi Chishiki to Naisei Doryoku de Fukou na Rekishi no Kaihen ni Idomimasu @comic

"This time, I'll protect my happy family for sure!" Takhir, a young baron who had lost his beloved family, was unable to do anything and thus labeled as an incompetent. However, as he was dying, his time-space magic suddenly manifested and he regained the memories of his previous life before being transported back to his childhood?! He no longer faltered in the face of war or the epidemic. He vowed to use his revived modern knowledge to improve their level of civilization... and to change his family's fate! By using his knowledge of the future, he was determined to reduce the damage caused by the poor harvest and flood, while doing everything he could to get talented individuals on his side, strengthening the Solis barony! By moving without concerning himself with the gaze of others, he would go beyond the Kair Kingdom, altering history across the entire continent! With his "family-first principle", the child prodigy would alter his depressing fate! His unprecedentedly large rebellion story begins! (Source: TO Books, translated)