NunuXD
Something that would be good for the next as an E rank -> D rank eventually would be something like Halo. Basically superior baseline humans with realistic and easily transferable tactical skills, but it could be built with more parkour and environment adjustments. The skirmish style warfare of an elite fighting an entire army would be good in this world. Flavor things could be added like blueprints for vehicles and energy sources would provoke a lot of attention.
From the previous tidbit about small spells and limited range option and now the melee and open world, I'm fairly sure it's going to be the Witcher. --- The problem is the open world aspect. Players have to actively use mana to play the game. That being the case, if they were forced to waste lots of time just travelling around (by foot or horse, regardless), they'll waste a lot of mana for no reason. They'd be furious regardless of the pretty scenery. Fast travel system has to be really REALLY widespread. --- But on the other hand, they can also develop the horse riding skill if they ride Roach. Not as useful in the modern age, but eh. --- Thank you for the chapters. Hope you're feeling okay and update soon.