Congrats on your successful money spells, Peridot! 
I know it’s tough to wait haha 
Some magic works practically instantly while other spells develop over time- I’ve found this largely depends on the spell cast and how big the manifestation is. Hopefully your money spells will continue to bloom into funds for you! 
As for banishing spells- I absolutely think you could use a banishing spell to banish debt 
If you’re drawn to the Banishing Bad Luck Spell, I say go for it! 
If you want to tweak it a bit or are considering designing your own debt banishment spell, the Spellwriting Process Post or the Creating Your Own Spell Lesson have some great tips about making custom spellwork.
Wishing you all the best- Blessed be! 