So it turns out that I had a problem with my RAM and was not getting the full 24GB that I expected, and I believe this caused my problems with getting the MetaHuman in the sequencer. To solve the issue, that opening the level sequencer would crash the engine after I finally did get the MetaHuman in the sequencer, I used the suggestions from this forum post, specifically #2 by opening my sequencer in a different level, deleting the control rigs, and then opening it up in the original scene that I wanted to use it in.
However, after solving my RAM issue (they needed to be re-seated because some of the sticks were not being recognized, I think only around 8-12GB were being recognized), I don’t have a problem with opening the level sequencer even with the MetaHuman inside.
Thank you @Mr_zero_kills, sorry for the delayed reply, I put the project aside for a minute. But I didn’t even realize that the MetaHuman had an LOD! This will make it easier to use in my games in the future. And I also did lower the engine’s scalability before, I think that helped me to get the MetaHuman in the sequencer the first time even with my RAM issue, so if anyone is using a system with 8-12GB of RAM, that should help.