Is silver a good idea to buy now?
I would say: no.
The problem with gold and silver is, they carry no utility other than past history. They can't be exchanges for goods or services. There's no infrastructure in place where precious metals can enable a form of electronic payment. They can be difficult to store and are likely easier to steal than say bitcoin for example. They're can also be difficult to physically transport from one place to another.
In addition to the above, there isn't anyone who actually uses precious metals for anything. It has no purpose.
This is where you are wrong. Both gold and silver are used in manufacturing. Gold is an excellent conductor, but it is also inert in that it doesn't react with water or other chemicals. That makes it incredibly useful. Pretty much every PC and laptop you use will have gold in the chips (which makes old computers valuable - always remove the gold before discarding)