While level 15 is best, most Aus managers aren't there yet so there are plenty of national team players with training facilities of level 12 or 13.
There will be a few bot teams in Div.I next season so with sensible management you shouldn't have to worry about relegation. The teams who finished in the bottom half of the table this season are mostly only a couple of seasons older than your team so you should be competitive with them quickly.
Invest in your facilities and stadium capacity and everything else will follow
