Have a website with about 40 navigation tabs. No problem for website. Yet when I do a website variant for cell phones How Can I create an Navigation platform that looks good and still be able to provide (perhaps with drop down nav bars) a person ability to select any of the 40 tabs

Here are two screen shots Website desktop variant and cell phone variant (with cell phone being the challenge.Click image for larger version. 

Name:	Screen Shot 2020-01-08 at 6.25.12 PM.jpg 
Views:	179 
Size:	65.2 KB 
ID:	126067Click image for larger version. 

Name:	Screen Shot 2020-01-08 at 6.23.05 PM.png 
Views:	173 
Size:	215.9 KB 
ID:	126068