You’ve got a lot of good reasons here, it’s just about how you phrase it.

• lack of opportunity for advancement
• frequent leadership turnover is disruptive
• you’re not challenged by your current role and you’re looking for something more challenging
• excessive technical debt prevents establishing forward momentum

Looking for new opportunities is extremely bland. It makes it sound like you’re bored or fishing for more pay. By being clear about what is wrong with your current environment, you demonstrate an understanding of what makes an effective team, and you feel you are ready for more responsibility. All good things.

Just don’t say anything about personality conflicts or you can’t stand your boss or call them all idiots or anything that sounds angry or overly emotional. Frame anything you have to say in positive or neutral terms. Like frequent leadership turnover makes it difficult to have consistent goals and direction vs. I hate constantly getting new bosses and each one is dumber than the last.