My jams are perfect even two years later. Some think the sugar is doing the conservation but it’s much more important that the jam glaces are really clean. I clean them with boiling water before using for jam and dry the glaces with paper towels.
I like to add some flavor as well to the jam. I used this year in one patch cinnamon and vanilla. But will be great any other flavor you like, also Rum, Amaretto, Whiskey.. the alcohol will fade away during the cooking. Flavors are added shortly before the jam is ready.
You can leave out the honey as well as the strawberries are already sweet enough.