So, no you cant, directly, withouth a mod, which i think should be in base game, but for now if you wait the city will recover passively, just make sure villages aren't constantly raided , garisson isn't like 400+ and it should all be well.

Mount and Blade. A subreddit and community for the Mount & Blade series, created by TaleWorlds Entertainment. 265K Members. 510 Online. Top 1%. r/mountandblade. You die because you're reckless. I die so I can spectate and watch my army kick ass. We are not the same.
Enjoy the -40 or -80 to everyone though. It's as Jorn Stones says, you're able to leave your kingdom (and retain your settlements) by navigating to the Kingdom tab, and selecting 'Leave Kingdom' in the top right corner (should be a red button.) I do believe the relation amounts are -20 if you leave and give up your settlements and -60 if you
Building a forum – The forum building in any main settlement you own adds +1 influence per day and it can be upgraded too; you can see the effects in the image below.
In Mount & Blade II: Bannerlord, the world is yours for the taking as long as you keep your influence high while dealing with other vassals. If you own a town/main settlement, you can build a
This feature existed in Mount & Blade: Warband - Viking Conquest. It was excellent. Reduced troop upkeep iirc. I used one to amass enough men to start my own kingdom in Cornwall. You could also build a dock and keep a ship there iirc. I'm missing that feature for similar reasons. It would be nice to keep elite troops stored up. Related: Mount & Blade 2: How To Make Money Fast Vostrum doesn’t usually see too much action because of this and can be considered quite a safe settlement to own. XE0c579.
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  • mount and blade 2 how to own a settlement