Use as many GPIO pins as possible on Beaglebone black

I would like to use as many GPIO pins as possible on a Beaglebone black board. I use the latest 4.14 image. I am not using HDMI, wireless, but I do need wired Ethernet and EMMC. So I have my uEnv.txt as below:

###Debug: disable uboot autoload of Cape
#disable_uboot_overlay_addr0=1
#disable_uboot_overlay_addr1=1
#disable_uboot_overlay_addr2=1
#disable_uboot_overlay_addr3=1