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If the needle reacts audibly to a gentle touch and if the tip (that's suppose to be embedded in the red painted part) is still there, you can try to crazy glue the top of the cart back into the press-fit plastic headshell. Otherwise, IMO, not worth any additional investment.
Honestly? Not worth the risk and not just junk but a fire hazard too, so I suggest you don't leave it plugged-in unattended.
In the late 60's/early 70's if you were 3 - 5 y/o - you had this:
then, you'd *upgrade* to this:
later, happy teenagers likely had one of the dozens of *portables* like this:
They all meant to keep little sticky hands and prying fingers away from dad's home stereo. Not vintage, just old and wasn't worth $30 new.
Now, 45 - 50 years later, this low end consumer grade electrical appliance can also burn down your home.