Problem extracting water level from large area with eo-learn

I apologize in advance if my problem is similar to other already treated.

Hi all ! I have a problem. I want to extract the water level of a very large lake in my country using the example detailed in “Measuring the water level of a Theewaterskloof Dam in South Africa” ​​(Measuring the water level of a Theewaterskloof Dam in South Africa — eo-learn 1.2.0 documentation) but I get errors regarding size. I can only extract the water level from part of the lake. Do you have any solutions for me ?