As long as we get 50% p.a. (POS) the easiest way to get more stones is staking/minting. Buy some stones put it in your PC- or Raspi-wallet, relax and look again to your wallet after 9 days . (Could take a longer time with a small amount of stones [if less then 5000 for example])

Here you can find a good advice for optimizing your POS-REWARDS by defragmentation:
https://twitter.com/PHS_stone/status/977292183106654208
This results in getting HIGHER REWARDS instead of many small rewards