When you say 'yesterday' what day was it? I mean yesterday really was a Monday. You wouldn't say from Monday onwards on Monday, you'd say 'from today onwards/today on/tomorrow on/onwards. We could use 'from now on'present, or 'from then on' if it's the past.
I think you have the right idea, it's just a bit confused with the reported thought.
"I've not been out much lately so yesterday I decided to go out every day from then on."
"From now on, if you don't put your plate in the dishwasher, it will not be washed."
"I'm getting up an hour earlier from Friday on(wards)."