Yes I understand the difficulty has gone up. February 18th shows 5000 TH. Today it's 5,800 TH. That's less than 20%. That should translate into approximately one day from five or six days to 6 or 7 days. Not 10 and 11 that seems a bit high. This is where I think I have a problem.
This post was done from my cell phone and voice to text it may not come out well.
Just like Vann said, its not the difficulty, it that in the past there were periods of high transaction fees which you got a part of. There were times when the total miner reward from transaction fees was more than double the block reward.
So at certain times you were getting paid 3x as much. Now that the NFT and DeFI craze has died off the fees have levelled off and hence why you are making less profit. The difficulty is only part of the reason your profits are lower. The rest is how much the network is conjested.