not done at all on everything , but:
1 the landing of the first rail section , a bit closer.
2 ; made the cannon rail longer and a bit less angled , plus arranged the wall down there so its possible to land on it,
3 on the right of that i added a landing too for the 2 boxes
then
4 i arranged the up box, brought closer the landing, same for the middle cannon rail
and the first jump i adjusted a little bit on the size type of things.
try to spot these