Can I write this without giving a bunch of spoiler warnings? Because I'm going to. Here we go.

Thanos uses the Infinity Stones to get rid of the Infinity Stones in Endgame. But he doesn't get rid of them completely. He says that he turned them to atoms. So technically they are still around.

The Ancient One even explains this to Bruce Banner when he's asking her for the Time Stone. Our entire universe is dependent on the Infinity Stones. By that rationale, if the stones no longer exist, our universe no longer exists.

Well, the Russo brothers, who directed multiple movies in the MCU, including Infinity War and Endgame have said that the Infinity Stones aren't completely gone. They were recently asked about the status of the stones, and their response was:

"Thanos only reduced the stones to the atomic level. The stones are still present in the universe."

BOOM! They are still around. Which helps my theory that Gamora is trapped inside the Soul Stone, and they'll need Adam Warlock to help get her out. In the comics Adam Warlock starts out the Infinity Gauntlet Event living inside the Soul Stone. Of course, since I'm this committed to this story line, it means it won't happen.