Hello Aault1040,
Sorry for the late reply, If you want more tracks than 16, you’ll need to upgrade to Cubase Elements 7. This will expand your mono track count to 48 (24 stereo) as previously mentioned. Once you upgrade to the Elements 7 license, when you open the software it will say Cubase Elements 7 (not Cubase LE, AI, Elements7). You can purchase the upgrade from the Steinberg website or any Steinberg dealer.
https://www.steinberg.net/en/shop/buy_product/product/cubase-elements-7.html