Please identify the disease and hence it's cure.
Cycus Plant Disease
Certified GKH Gardening Expert
I see flowers, and the start of a manganese deficiency. MANGANESE sulfate will cure this, as well as a little dolomitic lime. Make sure that this has partial shade, as this can cause burning too. This article will help: https://www.gardeningknowhow.com/ornamental/trees/sago-palm/how-to-care-for-sago-palms.htm