Welcome to AC!!
Glad you wont return, that'd be a big mistake.
Try uninstalling apps you don't need, clearing cache from apps, clear all browser cache. If that doesn't work, there might be some apps that you use that are causing the problem, and, you might need to deal with out or find alternatives for.
Also, if you are having problems running specific apps, you can always try reinstalling them, or, first clearing data from them.