I would advise you to be cutthroat with the items on the board and pick out only the things you really want to look at every day. With so much on there, it’s hard to pick out the most special pieces!
You could pick up a cute box or photo album to store the other pieces, so they’re always around to look at when you want to, but they’re not in your face every day!
After taking some things off, I would arrange the things still on the board in a spacious grid or some kind of a cool layout. Think of it in a design way, instead of a collage way. If you wanted to, you could even put the entire thing behind a frame to get a chic, polished look!