The best way to determine whether the traffic you are getting is quality traffic or not is to check the increase or decrease in the conversion rate. This means you need to inspect whether the people coming to your site buying your product or service. If they are new users, are they getting converted into paid customers?There are several tools that can tell you if and when this is happening. 

You can even compare the numbers from this week or month to the previous one to see if it’s getting better or worse. You can also learn about multiple visits and if those visits led to any purchases. 

If the overall traffic is consistent but the conversion rate goes down, you might not be getting high-quality traffic. Because it means that people are visiting the site but not buying your product or service. On the contrary, if you make a change and say

start focusing on keywords and see that there is an increase in the conversion rate, you can say you’re getting high-quality traffic.