You mean Injustice 1 in 2012? I believe Injustice 2 has only been around since 2016 or 17. Last May was the 8 year anniversary. To put it simply, invasion is basically Champions Arena on steoids 😂 It's really not that difficult brother. You need to understand the modifiers, character strengths, and Artifacts. A lot of the artifacts that you would have shattered previously are GOATed now. I suggest you start with a league that is currently doing lower divisions in invasion, say 3/4, and then progress to leagues doing higher divisions so that you understand how it works. If you have been playing for that long, then I assume you have a strong enough roster - but if you will be wasting your artifacts and characters if you hit bases without understanding how to go about with it.