Need help with itinerary (swiss-germany)

We were in Switzerland last summer and again in the fall. We have done all of the things on your Switzerland itinerary except Jungfraujoch. I feel like your first 5 days could all be done from the same home base. We stayed in murren and did thun and grindelwald day trips very easily. Lauterbrunnen and schilthorn of course are very close to murren. We could have done Jungfraujoch from murren easily as well, but chose to do beautiful hikes in murren/mannlichen instead. Maybe you like staying in a different hotels every night, but you may want to consider consolidating bases so you are not spending so much time packing and unpacking, checking out and checking in.
Our first time we used the Swiss travel pass. Worked great, just had to pay a few fares for cable cars that were not included. Second time we purchased a half fare card and berner overland pass. Worked great, just had to pay fares on way to interlaken area. Probably spent around the same doing the different passes, and can’t say one worked better than the other. I’d just go to the SBB office in the airport train station, show them your itinerary and they will tell you best pass to buy.
Have not been to Germany yet, have a 2 week trip planned in a few weeks! The only thing we have reserved in advance (besides hotels and rental car) is neuschwanstein)
Hope that helps!

Day 8&9. Take a tour from Munich that visits both in one day

I agree with the above recommendation to consolidate Days 1-5 into a single base. I like that you are doing 4 nights in Munich.

I will be in Bangkok for a few days in late May/early June!

Thank you everyone very much for the answers.
(I haven't been able to view this post since it was posted. I thought it was broken)
These answers helped me a lot.

You do realize that Linderhof, Neuschwanstein, and the Zugspitze are all in the same area? You're wasting way too much time traveling back and forth. Stay a night in Fussen or Garmish (or anyplace near there). The same with Interlachen and Grindlewald. And why not just stay at Burg Eltz? Seriously, you can walk all of Bacharach in a couple hours, St Goar also.

Thank you KGC very much for your reply.
The reason why I stay in munich and have a round trip to both Linderhof and Neuschwanstein is that I don't want to change hotel too often, and I want my plans to be flexible. Moreover, I plan to travel by train so I booked accommodation in Munich and planned round-trip transportation from there. In fact, I was interested in a tour that took me to Linderhof and Neuschwanstein castle on the same day as well, But I'm afraid I'll be in too much of a hurry. Has anyone had experience buying a tour to visit Linderhof and Neuschwanstein in one day? How was it?

I wouldn't sleep in Bacharach, I'd sleep in Boppard, and you're closer to Berg Elz. Boppard is a charming river town with many options for hotels and restaurants and transportation. I know Bacharach is an RS fav, but is very small and sleepy.
Have a great trip!

You can do Linderhof and Neuschwanstein in the same day.

Another advantage of Boppard over Bacharach is that if you stay in Boppard, you will get a free VRM transport card that will cover transportation by train and bus to Burg Eltz and back.