I remember very well when I was starting with road cycling. At that time I dreamed to ride 100km in one go. It sounded unreal and impossible. However once I did that, it seemed to be not that difficult so I was raising the bar higher and higher. Alpenbrevet Silver then Gold, Gotthard for lunch, Furka for dinner. Cycling from early morning till late dusk in mighty Alps... the limits are only in our heads. So what could be next?
Well, for example ride around Mont Blanc. Over 330km and 8000m climb. That looked good to me as a cycling challenge for 2018 ;-)