This.
If you haven’t already, checkout the video TR did on nutrition: 🎉 New Video! 🎥🧑🔬 Science-Backed Nutrition Plan for Cyclists | Cycling Science Explained
This strategy works for me, although I find I need 30cal/kg to lose weight consistently, occasionally dropping below that during quieter periods. YMMV of course
I believe belly fat is one of the last places to go, so it may require some perseverance.