TTC for almost 4 years

My husband and I have been trying for 4 years. Our 4th wedding anniversary is actually coming up and it would be an amazing anniversary gift. We are not giving up hope. My husband and I are both 37 years old. Any advice ? Words of wisdom? I would love to hear from others. I feel like everywhere I turn between family or friends everyone is getting pregnant. I know this sounds horrible but I wish it was me.