Interesting choice of series. Looks like most of them have a common theme, which is monsters.
For me, this is not manga, per se, but light novels. Sword Art Online is a given, and I've recently finished reading the Alicization arc, and moving on to the Mood Cradle arc. I think everyone is familiar with SAO.
Overlord is also one that I'm currently following. I actually started watching this based on a youtube clip that I saw. Then saw the anime, and moved to reading the light novel. This is similar to Sword Art Online, but the main protagonist doesn't have the ideals like Kirito from SAO. In contracts, he is more like an average joe.