How to Unload Levels in Sequencer? (not just visibility using level visibility track)

Hi, I have all my levels nested in a master persistent level & I have many sequencers.
In each level sequence, I use the level visibility track to turn on one level (where the shot is happening) & turn all the other levels off.

after a while, I noticed the project got very sluggish and by using “stat levels” I noticed all the levels are actually loaded and are just not visible😑

I was wondering if it is a way to actually load and unload levels in the sequencer, preventing all the levels to load in GPU memory, and making it crash and sluggish as hell?