Average Interactions based on historical dates

prasadhebbar315 , Create a date table, join with date of you table, have this columns in date Table

Have these new columns in Date Table, Week Rank is Important in Date/Week Table

WeekDay = weekday([Date],2)

Week Rank = RANKX('Date','Date'[Week Start date],,ASC,Dense)
OR
Week Rank = RANKX('Date','Date'[Year Week],,ASC,Dense) //YYYYWW format

Last 4 weeks = CALCULATE(Averagex(Values('Date'[Week Rank]), calculate(sum('Table'[Interactions]))) , FILTER(ALL('Date'),'Date'[Week Rank]>=max('Date'[Week Rank])-3 && 'Date'[Week Rank]<=max('Date'[Week Rank]) && 'Date'[WeekDay] =max('Date'[WeekDay ] )))

Power BI — Week on Week and WTD
https://medium.com/@amitchandak.1978/power-bi-wtd-questions-time-intelligence-4-5-98c30fab69d3
https://community.powerbi.com/t5/Community-Blog/Week-Is-Not-So-Weak-WTD-Last-WTD-and-This-Week-vs-Last-Week/ba-p/1051123
https://www.youtube.com/watch?v=pnAesWxYgJ8