 If you liked
Genjitsu Shugi Yuusha no Oukoku Saikenki
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 ...then you might like
Santairiku Eiyuuki
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Isekai character deals with administrating their kingdom, facing many oppositions and solving them one way or another. The biggest different early on is one stays a human the other reborn into an elf...
I'm not gonna say which exactly since that might break an unwritten rule, but I like one far more than the other. This is more of a one-sided recommendation honestly.
Both are isekai, with Genjitsu being summon and Santairiku being reincarnation. Both become rulers, both solve an economic problem, both are forced into war.
A thing that it different so far is that only Genjitsu have a harem. MC of Santairiku has a enjoyable relationship with his.. uhm.. childhood friend, who supports him.
Oh. MC of Genjitsu is human and has multiple races in the world, while Santairiku's MC is an elf with long lifespan. Latter also has multiple races.