Jemaa el-Fna at sunset is worth one evening of your life. It is not worth every evening. Give the medina a morning for Bahia or the Saadian Tombs, then leave for shade: Jardin Majorelle, the Secret Garden, a riad pool, a hammam.
When you have another day, go up. The Atlas Mountains day trip is the most complete change of register available within two hours. When you have an afternoon only, Agafay delivers a horizon.
Shop if you enjoy it. Hire a guide if you do not enjoy being invited into every shop. We can arrange either, or neither.
Marrakech is also a place to do nothing on a roof. Build that into the itinerary. The desert will ask for energy later.
Further reading from an official source: official Jardin Majorelle website (Jardin Majorelle — official site).