In the pursuit of promoting diversity, equity, and inclusion (DEI) in the field of Astrophysics and High Energy Physics, a group of young researchers at the Universitat de Barcelona (UB) and the Institute of Cosmos Science (ICCUB), under the scope of the DEI-ICCUB commission, has built a mentoring program for students in the Master of Astrophysics, Particle Physics and Cosmology at the University of Barcelona. This initiative aims to support and guide aspiring scientists through their academic journey and beyond, while keeping a focus on individuals from minority groups. The program started in 2020, during the pandemic, and initially targeted only female Master's students. In 2021, a group of PhD students formalized the program, now targeting two groups: students who belong to minority groups in academia, and a general group including all Master students interested in the program. The objectives of the mentoring program, which is still in operation, are to facilitate the engagement of Master's students with researchers across various academic levels, with a different focus depending on the group. The outcomes of the program have been positive and encouraging, with students reporting increased motivation, a sense of belonging, and tangible academic progression.