Auto-average 4 most recent numbers in a row

Is there a formula I can write that is always averaging the most recent 4 entries of a row rather than me having to change the formula every week? For example (image link below), I want it to automatically average C2:F2 once I enter F2, instead of me having to manually change the code in L2.

I have tried the following:

=AVERAGE(TAKE(FILTER(A2:J2, ISNUMBER(A2:J2)),-4)) but that only gives me the average of the first 4 cells, A2:D2. I tried changing the -4 to just 4 but that still doesn't work.

Can’t figure out how to insert image into a text post on iOS so here is a link: https://imgur.com/a/MDaPbhW

Thank you!