Hi @Mattw112IG
Please see the flow sreenshot below:
You could use a nested If condition (or just a sequential one too).

Here I am getting the day of the week using the expression:
dayOfWeek(utcNow())
this returns an integer 0-Sunday, 1-Monday etc,
Then I am comparing this with the particular day and based on that setting the variable to the date for the next monday by adding days to it. Expression:
formatDateTime(addDays(utcNow(),1),'MM/dd/yyyy')
This adds a day to the UTCnow if today is sunday and similarly we can do that for all the days.
It is a lengthy process but works.
Hope this Helps!
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