Certified GKH Gardening Expert
This has been a difficult growing season for gardeners. If you are getting flowers with no fruit, this is typically a pollination issue. These articles may help: https://www.gardeningknowhow.com/garden-how-to/beneficial/insect-pollination-process.htm
If you are not seeing any flowers, then it is likely due to a lack of phosphorus in the soil. This can be remedied by using a phosphorus rich fertilizer or adding bone meal to the soil around your plants.