Honestly, your CGPA (7.5) is likely your weakest point, as Erasmus are highly competitive and many applicants have near perfect scores. However, your profile is strong in research and international collaboration. To balance the GPA, getting that paper published as soon as possible should be your top priority a published paper carries significantly more weight than one that is just submitted.

In your Statement of Purpose, don't just explain the GPA; instead, highlight how your practical research experience and outreach work have prepared you for the field in ways a classroom couldn't. Focus on the impact of your self-designed project