Apply Query Changes : Taking too long , like hours or so

Hi Everyone,

My "Apply query changes' is taking far too long(more than 2 hours). This wasn't the case when I was working on the same dataset (2m rows) of data.

Recently I did some changes and removed some of the steps within the query that required Merged.

And now when I apply changes to it, is taking forever and seem like is stuck at loading a particular query and it wont move beyond it.

Is there anyway to improve the performance of my query?

Additional Information

I import all my data into PowerBI via Excel and did all the query within PowerBI.