If you've already booked everything why are you asking for suggestions? ;)

My 2 cents would be:

How are you getting from Interlaken to Chur? It will be a looong 4 hours in the dark.

Don't go to Zermatt. It will be 100% dark, no views or anything. Change in Brig to an Intercity bound for Bern/Zurich. It will already be a tiring day.

The rest is better but honestly you'll see little of Switzerland and be exhausted from the start!

Don't forget to make seat reservations on Prague - Berlin - Amsterdam. They are optional but at busy times expect to stand for 4h without one.

@hodlb103

Don’t forget to book also tickets with time slots for the Rijksmuseum and Le Louvre, and perhaps for other museums. I prefer the Musée d’Orsay in Paris, but this is only my personal opinion. If possible, don’t take any luggage with you when you visit these museums.

Be aware that strikes are common in most European countries, but you are flexible with an Eurail Pass, you can change your plans…

And trains are not always on time, you should also expect delays. 

For a solo trip I suggest to take a second smartphone with you as backup and a power pack if you have a virtual pass. 

Yes, I will take one train from Montreux to Zweisimmen, then from Zweisimmen to Chur, which will take about 4 hours. Thanks for your suggestions!

I will definitely change in Andermatt or Brig then will head to Zurich. I just booked a full route reservation since the price is the same, so I decided to book the entire route.

Additionally, I will surely make reservations for the Prague - Berlin - Amsterdam routes.

Thank you for your helpful suggestions, this is exactly what I wanted

Thanks for your valuable suggestions, will pre book this tickets too.