Have you tried the “rotobrush” tool? If not, it’ll probably require a short tutorial. But it works great to git rid of the background. It creates a travelling matte, but you don’t have to go frame by frame and manually correct the matte on each frame. Rotobrush does it for you.
Here’s a pretty good tutorial.
Good Luck!
https://youtu.be/Tr1YIX_SZW4?<wbr>si=Ro2UbicoenGmS7H4
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