As already people suggested here to use mashup.
1. Use mashup. Refer these links for your requirement. I had the same problem where we have 39 sheets. I used approach from link below to overcome.
2. Also in new version of QS, a feature enabled to use right and left arrows from keyboard to navigate across sheets.
Please try if you want to avoid mashup
Qlik Sense June 2018 lets you resize sheets and extend them vertically.
In the sheet properties there is a new section near the bottom where you can either set the size of the sheet or allow it to extend vertically.