I have daily level data for time series, and i am trying to understand whether it has a trend or seasonal component. The data i have is only for 699 days, so less than 2 years. To convert it to time series what frequency should be set? I have read about it and suggested value is 7, but looking at the data i feel there isn't a seasonal component in it at all. Below is the plot of the time series.
Please suggest how can i go about it. Thanks!