Each time a validator performs a task, it generates income which can constitute good profit with time. The number of the performed tasks depends on the capacity of a validator and the total number of validators. According to the official information, you can expect the annual rate to be 15-18% during the first year and 8-10% during the next one. You can use a calculator in your personal account to estimate profitability.
Thanks. I have one more question regarding the difference between Eth2 and Eth1. Could you please tell me more about it?
Eth2 is an enhanced version of Eth1. The consensus algorithm was updated and this let to use blockchain as a proof of stake, relying on the validators.