Improving quality score

[Alpacala]

What are the most effective methods to increase Adwords quality score my friends? As you know, a rating out of 10 is given based on your website and keywords, and this can vary depending on the site. In your opinion, what is the most effective factor in this regard? What distinguishes high-quality sites - could it be site age, external links, etc.? I would appreciate it if experienced friends could provide information