Rate my itinerary for Switzerland week after Easter 2027

Starting to plan Easter 2027 (w/b 29 March) and finding it overwhelming with how many things there are to do & see. Our plan so far is this, but if we can ‘slow it down’ a little and stay within 7 - 8 days, it would be ideal. What do you think of it? Should we remove anything? Are we missing a ‘must do’? Thank you Day 1 Flight to Zurich, train to Brig Day 2 Brig - Zermatt (Gornergrat railway) - Brig Day 3 Brig - Betten - Bettmeralp - Bettmerhorn - Brig Day 4 Brig - Centovalli - Locarno - Belinzona - Brig Day 5 Brig - Andermatt - Disentis - Chur - St Moritz (Albula line) - overnight St Moritz Day 6 St Moritz - Zurich Day 7 Zurich Day 8 Flight back