You're actually doing better on gear than I was at your level. I'm still wearing some of the pieces you are wearing at 60. One nice thing about bards is we really aren't gear dependant. I would just hunt for xp and level up and not worry about buying stuff. Only thing I recommend buying is a good drum (probably Darkskull drum) and basically save until you find something really nice you want to buy.
If you want to upgrade a few slots, look at doing some quests. Bard Starfall quests and the first couple Newport ring quests can be done around your level range.