Absolutely, @Babywitchbxtch! In fact, I think writing your own spells (or customizing existing ones to better suit your needs) is a great way to go about spellwork. You are able to customize the direction of the spell to exactly what you need, and can make sure the spell works with the ingredients you have available 
That being said, writing your first spell can be a daunting task- especially for those who haven’t been practicing for very long. Luckily, there are guides to help you begin writing your very own spells!
→ Spells8 Lesson: How to Write Your Own Spells
→ My Spellwriting Process
→ Can You Cast a Spell for Me? Why You Should Cast Your Own Spells
→ Spell-ing Bee Challenge: Write Your Own Spell
Good luck and happy spellwriting! 