You could acid wash your zeolite. For an etherification rxn the following reference provides Information related to washing a HY zeolite for catalysis. Acid washing doubles the catalyst's efficiency.
L. Xiaoa, J. Maoa, J. Zhoua, X. Guob, S. Zhanga, "Enhanced Performance of HY zeolites by acid wash for gycerol etherification with isobutene". Applied Catalysis A: General
Volume 393, Issues 1–2, 15 February 2011, Pages 88–95