How to create increase/decrease value in a period?

I don't know if a given value is increasing or decreasing in total value for that value every month.
I would like to illustrate that this is the case.
I'm thinking of realizing this using Timelion, but I'm troubled, and I'm not sure how to use it.
I would like some advice.
As a procedure, we believe that it can be done by achieving the following
Is it possible to aggregate periods in Timelion?

One. Sum value in one month
Two. Get the difference of time series
Three. Calculation of change for difference

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