Check if the max server count has reached its maximum. Check this by scrolling down at minehut.com. If it has, servers won't be able to start up for a little bit.
If this doesnt work, try repairing any potential broken files in the dashboard danger zone.
If THIS doesnt work, try repairing plugin config files in the dashboard plugin tab.
If THIS doesnt work EITHER, make sure you have 12 plugins, unless it's a paid server.
If NONE of this works, go to the minehut support discord server and contact for help there.