I definitely agree with Nat that going through all of your stuff is a great place to start your redecorating process. Everything is piled up, so it must be hard to even realize what you have! Sort through it all, and this will help you not only eliminate what is not needed but organize the remaining things into themes that can then be put away accordingly.
Painting your furniture is a great way to get that neutral, minimalist feel, and if you still find that you don’t have enough storage, consider getting a set of nice white baskets for above the tall storage unit or a clean white bookshelf for that corner that is filled with things! Storage is definitely key but it can also be great to design and decorate! I helped Chriselle Lim decorate some shelves in her home, for a point of reference for that mix of storage and design.