I ended up falling on the eleventh day

This was my first time trying “nofap”. I managed to survive eleven days without porn or masturbation, but today I ended up giving up because I was very horny, and since the sixth day, I've been having thoughts of sex. What I realized over the past few days was that I really didn't feel like I wanted watching porn, but every day I was very horny, not only when I woke up but throughout the day because I have a lot of sexual thoughts, and I'm trying to fight them. What I did when I thought about it…I just started to listening some music, going for a walk, or writing to help desexualize my mind. I blocked sites of porn to avoid temptation. I'm off social media (only YouTube and Reddit), and I also stopped watching ASMR videos, especially of hot girls, because that was a trigger. But even with all this effort, I gave up. The good thing is that I only masturbated and didn't watch porn.

What can I do to become mentally stronger for this second attempt at “nofap”, what tips do you have?