I suggest you do the following three relatively cheap upgrades:
- replace your hard disk drive with a quality SATA drive like a SSD of the Samsung evo series.
- increase RAM to 8 GB (you don’t need more)
- use Linux if possible.
For casual use, you can resurrect old laptops with Peppermint, Lubuntu, or Manjaro Linux XFCE but there are many other options too.