Over time, personal devices and computers can become slower to respond to actions, gestures, or to boot up applications. When this starts to happen, generally we think of what kind of device or computer we want to replace our old ones with.
A great thing you can do instead is to refresh, or reformat your device! By formatting your device to factory settings, it can help prolong the life of your device/computer and keep it running fairly quickly. However, make sure you properly back up your data on your device/computer before you reformat it: follow the 3-2-1 backup rule.