Yes, your relative hash power does give you a smaller and smaller piece of the pie all things equal as more hardware mines the blockchain. However, the increase

Yes, your relative hash power does give you a smaller and smaller piece of the pie all things equal as more hardware mines the blockchain. However, the increase in the USD price of ETH and also the demand for transactions on the ETH blockchain have both gone way up (i.e. the cost for a transaction of a given size, a.k.a. "gas", measured in "gwei"), and the balance of those three factors means mining on the same card is currently much more profitable than it was in the past. Uniswaps and NFT's are large transactions and bid up the price of gas, and have been very popular as of late.