Roan, ran away 20 years ago from his rural village in the aim of becoming a Great General. However, all he got 20 years later was just a handful of money and the lowly position of squad commander of the First Legion’s.
In the end, he became a cold corpse in the battlefield… but somehow, he came back in the past.
“Alright. This time, I won’t become a Great General but a Monarch.”
His previous life’s aim was becoming a Great General, but, he only became a spearman squad commander.
This time, his life’s aim is becoming the Monarch.
“Then I guess I’d become at least a General, right?”
And his other stories, are all good reads, God protagonist is his goal in all stories/a build up towards. These are probably the best army building fics I know. (You may want prior knowledge of WH40k and/or sc2 zerg, And Stargate)
You could try Goblin Kingdom, it's super coolio. It features goblins (obviously) with an awesome protag that has actual flaws, so he's not super OP. Not sure about romance but where I am, he has only one love interest.