Are your varieties determinate or indeterminate? You can force determinate varieties to set fruit by topping. This is a practice used in higher latitudes, when you’re trying to get fruit inside a short summer season. Indeterminate varieties take longer to fruit but will keep going until first frost. This is a vine type, so it needs a trellis, as opposed to cages used for determinate varieties.

If you aren’t sure which one you have, a google search on the variety name should tell you.