How to restore faded gold?

[BhambriRohunu]

"I've observed that the gold finish on some of my hardware has gradually faded, revealing a silver color underneath. I’m interested in knowing if there is any effective way to restore or touch up the gold finish that has worn away. Could you recommend specific products or techniques to achieve the best results for restoring the gold color? Additionally, are there any preventative measures or maintenance practices I can adopt to protect the gold finish and prevent further fading in the future?"