I try to grow peaches here… have 3 trees now… (organic, no spray) and well it is mostly just disappointing. Except for those few early peaches that I get that are not infested with OFM, or not rotting on the tree (brown rot). Peaches are one of the most challenging fruits to grow (I think) unless you are OK with spraying a bunch of chemicals on them… I have to pass on that.
If you decide you are going to have to replace the tree and you want to try another peach variety… I would recommend trying one that ripens early, and is known for disease resistance. If you search here you can find some details on that.
There are a lot of other things you can grow, and many that you can grow with no or low spray that are (well not a peach), but still very good. You might find something to replace it with from the post below.
Good Luck.