You have a couple of options. The first is simply removing your atty every night before bed, turning it
threaded/battery end up and letting it drain on a paper towel over night and then pitching it once it stops producing the level of vapor you're accustomed to and find preferable. The other is a deep clean, although atties are so cheap this is oftentimes a bigger pain in the rear than it's worth. You can boil your atties or soak them several hours in a solution such as white vinegar, isopropyl 99% alcohol, etc. I will usually only clean my atties once before I give up the ghost and purchase new ones. I'm still coming out way cheaper than when I was smoking analogs.
On refilling carts, That Guy with a Fedora has a great video on that: