Utilize is a commonly used term, but it's not the only word you can use when you want to convey the idea of using something. For instance, if you want to emphasize the practicality of using something, you could use "employ." If you want to suggest "make use of," "avail" works well.
"Apply" is also a valuable synonym, suggesting that you are using something for a purpose. "Exploit" can be used if you want to convey the idea of taking full advantage of something. "Useful" works well when you want to emphasize just how helpful something is.
These are just a few synonyms for utilize, but they will add a fresh dynamic to your writing and help to make it more engaging.