There are 3 most common reasons if your dell Bluetooth driver not working -: (1) Too many devices are connected (2) Corrupt it outdated Bluetooth driver (3) Device not in range or not in pairing mode I can suggest you two methods - Manual or Automatic. Manual processes it time-consuming and there is a chance for mistakes. I will recommmend for the automatic process, This is less time-consuming and, when your drivers will be outdated, you will get a notification to udate drivers automatically.

Remove un-useful files and folders and create a huge space in your macOS memory. You can try advanced uninstall manager to delete any data on mac.

Following causes may occur - (1) charging issues (2) perform a power cycle (3) check your battery (4) check the screen (5) Use Your Computer to Troubleshoot (6) reset your device

Just use a mac uninstaller and create a huge of free space by removing unwanted files and folders.

You need to keep up to date your mac. Update it manually or automatically. In automatic process you need an software or tool. In manual way choose Apple menu > System Preferences, then click Software Update. You can clixk on Apple menu button where the number of updates are available. Tip: You can also click the Apple menu—the number of available updates.

Follow these steps - (1) Go to System Preferences -> Users & Groups. (2) Click your account (also know as Current User). (3) Click Login Items. (4) Look for "Advanced Mac Cleaner" entry. Select it, and click the "-" button to remove it.