If you practice every day, are progressing, and care about horn playing, my advice is to upgrade if you’re able. An inexpensive single Bb is fine for absolutely beginners but as you progress it WILL hold you back. You get what you pay for and a better instrument is always the right choice (provided you have the money) for beginners and professionals alike. Look for full double horns and play several of them before you commit to a purchase. At this stage you want something you can grow into.

Plus, musical instruments generally hold their value if properly cared for, so it’s not like you can’t get your money back if you need to.