Atoosa writes;

I’m really interested in this route and want to start cycling from Milan to
North. I’d like to know how did you pass The Alps? did you go with [the] train?

No I didn’t – I went over the top! You would be doing it in the opposite direction of course but if you followed the same route as me you would cycle from Milan to Como to Bellinzona in Switzerland then up the valley to Airolo, over the Gotthard Pass and down to Andermatt and onwards along Lake Lucerne and northward. I recommend the route; much better than a tunnel! You won’t regret it. Good luck!