I think he needs to create a new clan, or revive otsutsuki because he's more like otsutsuki and he's not an uzumaki now. btw if you want to make uzumaki not extinct he just need to have children with lots of karin.LOL
mc's way is very good, instead of making himself disguised he chooses someone else to do it and knows everything there while remaining unknown because even in taking over the slave language he doesn't show himself