Staking on rocket pool: how to assess rewards?

A couple of months ago I decided to stake some ethereum using rocket pool, so I converted ETH into rETH and then started monitoring the conversation rate. What I'm seeing now is that swapping back to ETH doesn't really provide any real gain. Assuming I converted around 10ETH, into rETH, swapping back using the RocketPool would give something between 10.020 ETH. This kind of figure doesn't seem to change as weeks go by. Is there a different way I should unstake? Thanks!