Struggling with Lustful Thoughts

Assalamu alaikum everyone, I'm a Muslim brother who's 28 years old. Honestly, up until two years back, I wasn't really practicing my faith-missing prayers, committing sins, and just not living the way a Muslim should. But alhamdulillah, I'm going through a time in my life that's drawing me much closer to Allah, and I'm trying my hardest to be a sincere and gentle-hearted believer. The thing is, staying away from zina has been my biggest test. I won't hide it-I've fallen into this sin many times in the past (please make dua for me, not judge), but with Allah's help, I've managed to avoid it for 1 year and 3 months. Lately though, it's been really tough. I keep feeling like I'm missing out, and Shaytan whispers that slipping once and seeking forgiveness later is okay. But deep down, I know if I give in, it'll be hard to stop. So I wanted to ask my brothers in faith: how do you all guard yourselves against this sin? Any advice or reminders would mean a lot.