I'm looking for advice

Hi guys, I've been on fivesurveys for a week, and I've earned 24 euros. The idea of ​​5 surveys for 3 euros is very nice (yes, 3 euros, unfortunately in Italy they don't give 5 euros but 3) but there is something I don't understand: This Monday I had a lot of surveys, I completed 10 surveys in one day and I made 6 euros, the following days sometimes I did 10 surveys, other times I stopped at 5, today which is Sunday however I didn't have many surveys, I only managed to do 3, I didn't earn anything, why? can you help me with this, also today I was much longer than the other days, how is it possible that no polls appear.