Staking rewards in Phantom

Please mods before deleting this know that I’ve tried to find this information elsewhere and I’ve been staking SOL in different ways for about 3 years.

I started staking through Phantom several months ago and my supposed 7% APY return got me only pennies. I staked over 23 SOL. I restaked recently with a new validator and just like the last one my rewards drop. I’ve never staked another token that had diminishing returns. I understand the value can drop but why do the rewards decrease? Even Trustwallet got me actual returns as much of a nightmare that platform was. I’d never go back to that, as I don’t trust “trust” wallet at all. All the research led me to Phantom, but after 4-5 months of staking I’ve gotten less than $1 USD worth of SOL, and I’m staking over $3,000 USD in value.