Being Demoted To The Frontier, I Killed Myself Across The Entire Continent

At the beginning of the time travel, I encountered Immortal Jump and was relegated to the frontier to fend for myself.
The emperor wants to trap me, and the prince wants to assassinate me. Little do they know that I have mastered modern knowledge and will attack you in a dimensionality-reducing way.
My lord, the border town is the territory of several of my big families. If it’s a dragon, you have to curl up. If it’s a tiger, you have to lie down. Okay, then I’ll push you flat.
The barbarians on the border are attacking each other and asking me for help?
Your territory is too small and there is no point in attacking each other. Let me show you what a unified situation is.
The navy on the island is too rampant, so build ships, destroy them all, and incorporate the territory into my territory.
Your Majesty, we have not expanded externally for three months. The soldiers all want to make contributions...
When the emperor saw that I was powerful and wanted to take back the territory, he found that it was already too late.
When I led a million troops to besiege the imperial city, it was too late for the emperor to regret...