Remove unnecessary software from your computer. You can remove the heavy and non-usable apps from the Apps & Features in your windows.
Activate Storage Sense to free up enough space in your hard drive. To free up your hard drive you can delete unwanted and large files directly from the file manager.
Update your Windows. You can update your Windows from the update section to fix and optimize your system performance.
Optimize your Startup from the task manager in windows.
Run a regular full scan using Anti-virus software.