Recover or find close Group Tabs?

Hi, is there a way to recover group tabs or find them somewhere? I am a school teacher and all of my group tabs got closed. I have searched several blog posts and have done everything that they have suggested to recover tabs but it only recovered two groups and I had at least 10. The Reopen Closed Tab option is grayed out, but it hasn’t opened even half of the tabs and groups I had opened. I tried to go to my history, but that doesn’t have the group tabs and there is no way I am going to recall what was under each group tab. Is there a way to see the created Group Tabs and reopen them?