Isn’t this answer easily findable? It’s a clear response to the aggressive US/IL foreign policy in the area. Here’s an excerpt from an article in late ‘23 -
“The Houthis […] say they are targeting Israel-based ships or vessels headed to Israel. They are attacking ships as they cross the strait of Bab el-Mandeb, connecting the Red Sea to the Gulf of Aden.
The Red Sea hostilities are part of a pattern of Middle East attacks from Iranian-backed groups against the U.S. and Israel in response to the Israel-Hamas war.”
https://thehill.com/policy/defense/4382064-houthis-force-car...