It's a good sign that your red line is so solid.

There is no restoring force. The cards don't remember that you had bad luck before. They don't try to make up for it in the future. You might have good luck in the future, which will make the difference between your red line and green line shrink, and you might have bad luck which will make the gap grow, in $.

What you can say is that if you play a lot, there is a high probability that the gap between your red line and green line will be small in %. It's just like if you get 2 heads and 8 tails in the first 10 tosses of a coin. If you flip the coin 990 more times, you might see 480 heads and 520 tails. That would mean the % heads grows from 20% to 48% even though you still had more tails than heads. Your EV-adjusted ROI will probably get closer to your unadjusted ROI even though you could be slightly unlucky over the next few thousand tournaments.