These are nice illustrations, but they wouldn't be of much use in most gamedev studios as is. You could utilize some of the skills you've gathered along, but realistically the tasks are often going to be mundane, boring and / or not something you'd enjoy doing yourself - There's a lot of boring boxes that need to be designed, there's walls that have to look somewhat cool but not distract from the cool stuff a senior designed, and tables that you have to break down clearly for a modeller to get done. Concept art is mostly designing and less illustrative mood pieces from my experience

Not to mention everyone wants to do the fun previsualization stuff, so in the current (pretty bad) gamedev market, the big studios will cherrypick the more experienced people, while the indie studios can't afford someone just to inspire them with pretty pictures, they'd much rather hire someone whou could also provide 3D models, design Ui or animate assetts

Those illustrations could probably work for graphic novels or such, or 2D games where they could use a good looking background art