My phone speed is very slow how to fix it

Does your phone often heat up? Over time, heat damages the phone's CPU and can cause it to slow down a lot. One thing I would do to control the heat is to not use it too much while it's charging. If the phone is too hot, it will slow down. If the phone is too cold, it will slow down. To speed it up as much as possible, ruling out temperature, I would do the following things:

1. Update the software on your phone. Keeping the software up to date may clean up bugs and make your phone more efficient.
2. Uninstall and delete any unwanted apps or any apps that might be running in the background that could be slowing down your phone.
3. Check for any unwanted apps running in the background. Go into your phone settings, and go into Application settings. I'm not sure what your menu looks like, but navigate to application permissions/apps background activity/applications running in the background. From here, you can uncheck a lot of apps that you didn't uninstall in Step 1.
4. Turn off Location services or any services that constantly track your location. Google Maps has a feature where it creates a timeline of where you've been and tracks your location constantly. This drains both power and battery. By turning these types of services off you conserve energy on your phone, and if your phone doesn't need to go into low-power mode all the time, it could be faster.
5. Turn off low-power mode. This will cost you battery life, but after all the steps above, you might be able to last a full day without low-power mode.