My suggestion is to upgrade as the PC and software industry evolves a lot faster than you definitely thought. If you are playing games and you think your PC couldn’t just handle it, investing in some low profile GPU (link removed by moderator)
I can share with you a few boosting guides though like overclocking? Or increasing your page file? There are also others like disabling Window’s Fullscreen Optimization, or simply disabling other processes that eats performance that you don’t actually need. Well, just reply which one might interest you and I’d be so glad to help.