Trollishly create false records of the present, your present, so that future researchers and historians will puzzle over them or perhaps blindly accept them as truth.
Falsifying the present seems easier than falsifying the past, because the past requires access to historical records.
What kinds of false records will the future be most likely to be gullible to? Perhaps ask current historians what types of records of the past they struggle to find or verify.
Coming soon will be significant climate change. Record what life is like before climate change.