Having a well designed and maintained instrument is absolutely crucial to proper musical development. Each note needs to play clearly and in tune with minimum effort. It is disheartening, especially when learning, to play on an instrument that leaks.
I studied instrument making and repair at Newark college 20 years ago. Since then I have worked and played on a huge variety of instruments including those of top professional players.
It is sometimes difficult to quote precisely without seeing the instrument or it may just need a "tweak" which can often be done while you wait. If you bring your instrument into the workshop I can advise on any work it needs and tailor it to your budget.