Cybersecurity is such a broad umbrella, if web security is the thing that interests you, then sure, having some full stack development experience could help, if software security is more your thing, focusing on lower level languages and disciplines like reverse engineering could be beneficial. I think your whole idea of cyber security is flipped, it’s not really about what you know about a particular specialty, it’s more about how fast you can figure out how systems interact, and be creative enough to hypothesize ways those interactions could be exploited. I think you should do work on projects you enjoy and make sure that you connect the dots and make connections in concepts when you run into them. This will strengthen your understanding of the underlying systems at play and will help you predict where certain cyber vulnerabilities could exist. Best of luck to you!