What kind of memory and what speed to your currently have? It's DDR4, and not DDR3? Is is higher speed memory or something below 2666mhz? That might be an important factor. What you have now might not even be compatible with the platform you wish to ugprade to, so it's best to at least ask that question in order to be sure. Take nothing for granted is my approach, that way basic mistakes can be avoided.
Do you actually understand, no offense, but most people don't, how damn BIG a full tower case actually is? They are HUGE.
Likely, most mid tower ATX cases are significantly larger than your predator case, without being as outrageously huge as a full tower ATX case. I'm happy to help you with recommendations if you are actually sure you need a full tower case, but generally speaking, if you are not planning on running 8-10 various internal storage devices, or using an EATX motherboard, there are very few use cases where a full tower case makes much sense for the average person. Glad to point you at some good ones if you're sure that's what you want, but I'm telling you, they are overkill for anybody who doesn't specifically and fully realize the sheer immensity of a full tower case by comparison.
Are you planning to do liquid cooling or anything else that might offer a good reason for it? I'm just wondering. Because, for example, I have a mid tower Fractal design Define S, with six drives, a very large power supply, full size ATX motherboard, 8 fans including the two on the CPU cooler and the one cooling my M.2 drive, and I STILL have a great deal of extra room around all my components with plenty to spare. Particularly if you go with a case that mounts the drives on the backside of the motherboard tray, rather than in drive cages in the main chamber.
This is my mid tower case. Which is pretty big. A full tower will be significantly larger. Not that I don't think you don't know what you really want, it's just one of those things you want to be sure about because I've been through this before with a number of people and in EVERY case, they were like "Oh damn, I had no idea it was actually THAT big".