Hi Lisa!
Here are the quick fixes:
Extend Year list
Use a dynamic list for the Year dropdown:
=SEQUENCE(15,,YEAR(TODAY()),1) → auto-creates this year + next 14.
Make month dates auto-fill (Year in Settings!B2, Month # in Settings!B3)
=LET(y,Settings!$B$2,m,Settings!$B$3,
s,DATE(y,m,1)...