You might be able to add more memory (you would need to check how much memory it could take). In any event 4GB would be the max. total.
I'm sceptical as to whether this laptop would have a SATA hard disk. If it does you could change to a Solid State Disk (SSD). If not you're stuck with what you've got.
That's about it. Laptops are not very upgradeable (e.g. it is not practicable to put in a new processor).
In any event, the whole thing would be dragged down by the very old architecture.
Bottom line - don't bother even thinking about it. Get a new laptop,