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This article will refresh you on the care requirements.

https://www.gardeningknowhow.com/ornamental/flowers/dianthus/growing-dianthus-plants.htm

Cut the stem all the way back to the foliage if it is just one spent flower on the stem. Sometimes though you'll get a spent flower on a stem that has a new bud forming right next to it. In this case, just cut the spent flower off and let the new bud flower

This could be a sign of nutrient deficiency or improper watering. Try fertilizing it with a general fertilizer like miracle grow or Osmocote slow release fertilizer for flowering plants. Also the plant may need extra water during bloom periods, but when you water do not do it from above, try to water right at the root zone without getting the flowers and foliage excessively wet. Dianthus flowers can be short lived but deadheading most varieties will help them reblooming. This article should help
https://www.gardeningknowhow.com/ornamental/flowers/dianthus/growing-dianthus-plants.htm

Though Dianthus is a pretty perennial, I would not consider it low maintenance.

https://www.gardeningknowhow.com/ornamental/flowers/dianthus/growing-dianthus-plants.htm

I would suggest a flowering shrub, suitable to your growing zone.

https://www.gardeningknowhow.com/planting-zones/

Visit local garden centers and greenhouses for some ideas.

Cut the old growth back to about 1 to 2 inches in height.
If you did not do this in the fall, you can cut it back now.

https://www.gardeningknowhow.com/ornamental/flowers/dianthus/growing-dianthus-plants.htm

It isn't completely necessary, but it does help the plant significantly. This article will give you more information: https://www.gardeningknowhow.com/ornamental/flowers/dianthus/growing-dianthus-plants.htm