Make a bias list, the top one should get the most of your attention, and keep going like that! continue paying attention to all the groups you like, just make sure you know who you'll choose if you have to choose between them. (I focus on alot of groups, but if I had to choose I know I would always side with SHINee)

Although my fandom is EXO I think since you like all three you might as well stan all three :)