MetaMask could be safe enough if you NEVER put your private key in your pc in plain text format nor image. But in all honestly, if you have 20k Link I'd just drop $99 to buy a hardware wallet. Nano Ledger S is pretty cool and I'm happy with it.
Help a brainlet store his stinky linkies
Oliver Hill
Luis Thompson
link is blockchain agnostic, any wallet will work to store your linkies securely