To raise their rating, they attract the assets of other holders by paying them a portion of their share. Of course, you can try to become a validator yourself, but then you have to have enough money and ensure that your node synchronizes smoothly with the network. Also, in most POS systems, validators are selected and re-elected by voting. If you are a newbie, you have almost no chance of being elected. But this way you just lock the coins into a separate address, and after a certain amount of time you start getting dividends. That's how staking works in general terms, although the specific requirements may vary from blockchain ecosystem to blockchain ecosystem. So carefully study the staking requirements of your particular peer-to-peer network.