Letters/Numbers Worn Off of Keyboard

there is not much to do you could try to find some new keycaps, but membrane keyboards really won't let you switch the keycaps out the part of the keyboard with the letters so you will have to buy a new keyboard if you want the letters back. If you type a lot, I would recommend a mechanical keyboard if you like a typewriter note with a clicking noise than the best will be any kind of blue switch if you want something quiter than any liner switch will be good but if you wear the keycaps you can replace them on these keyboards.