New here - Need advice how to fix stuffing of a plushie..

It‘s my first post here, but hopefully you can still give me advices. My problem is the following:

I bought an older big plush kangaroo, which is still in kinda good shape. But the stuffing shifted out of place so it doesn’t stand upright anymore. How do i fix this, without damaging the plush? Already checked it, there no zip to open it, so it must be sewn close after stuffing? 🤔

Sorry if that’s a dumb question, but i‘m not so experienced with plushies (just have a small collection)