Same height and similar weight to me. I consider myself skinny.
I cycle a lot more than you do on a lot less calories.
If you’re looking for something different to try though…
Try forgetting about the carbs, concentrate on the type of food.
Packaged food, tinned food, canned drinks, bottled drinks… it’s all got sugar in which messes with your insulin levels. Cut them out.
Cut out the high carb foods.
See where that gets you.