By your own admission you are new to the game, just hit level 85 last month, right,
You are spread too thin by trying to get every squad ready at once to get everything as fast as it shows up. Build one squad, then the next. You are forcing this artificial shortage by trying to build every squad needed for every event in this game in what appears to be a couple month timeframe. As I said, it’s a you problem. Those you tube vids, . . Are guys 5at have been playing for a long time and know what they are doing, and have developed rosters. A brand new player cannot expect to develop all those squads in a month or two like you appear to think you should, unless you are willing to buy everything, then you might have a chance.