can i be host usb without OTG and USB-A on stm32
The STM32L433 can only operate as a USB device. It cannot act as a host.

The STM32L475 can be used as a USB host. Use a USB Micro-AB socket, and wire the ID pin to OTG_FS_ID (PA10). The USB peripheral will perform ID line detection and switch roles as appropriate -- if a USB OTG adapter is plugged in, for instance, it will detect the grounded ID pin and switch roles to a host. See the reference manual for details.