Please recommend some novels that are similar to the finished heavy-duty mechs.

I recommend "The Infinite Journey Begins with the Demon Hunter." Although it's not the exact same genre as the Heavy Mecha Soldier, it's still an infinite genre novel. The main character will go to different worlds to carry out missions, so it might suit your taste. The book is finished, and the plot is quite compact. I suggest you give it a try. I hope you like this fairy's recommendation. Muah ~😗