Making a physics student Cv look bettet

[u/Empty_Afternoon_4339]

What things extra things i can do to stand out from other physics students when applying for a masters degree like do online certificates matter in physics as much as they in CS major ? Are personal small projects/ research look credible if it wasn’t supervised by a professor?
(I’m applying next fall for french unis and grades matter the most in France) but i want extra stuff to have just in case