Well, the problem may be not so difficult to address... my advice is to start from the CPU and this alone will cut your options by 50%... then think at the features you really need, like wi-fi, USB 3.1, one or two nmve slots, USB-C, RGB lights, and so on... you will quickly reduce your choice to a small bunch of motherboards... If you are upgrading a gaming PC you should already have something in mind...