Move Ai enemy character without navigation mesh bound volume

I want my ai enemy character to move forward and forward and it is not possible because navmesh is required for ai characters what to do to make my ai enemy to just move forward

ok then use a nav mesh, or use nav agents. you never actually asked a question and you never said why you dont want to use a nav mesh. or you could always create your own pathing system based on A* or something similar.