As your system has soldered RAM & SSD storage there is very little you can do to enhance it.
* Keeping 1/4 of free space on your storage can help. I would move to an external drive any stuff you really don't need day to day.
* Limit how many apps are concurrently running. You might want to get a RAM cleaner app to help recover unused RAM or just to monitor whats available.
* I would also get a good anti-Virus & Malware app.