The references to “true love” and “gifts”, as well as the counting down from twelve, suggest the song The Twelve Days of Christmas. Each answer may be paired up with either one or two of the gifts in the song.
12 Drummers Drumming: The Little Drummer Boy
11 Pipers Piping: The Pipes are Calling
10 Lords a-Leaping: Lord of the Rings
9 Ladies Dancing: Dancing Swans
8 Maids a-Milking: Maid Marian
7 Swans a-Swimming: Dancing Swans
6 Geese a-Laying: Egg-Laying Hens
5 Golden Rings: Lord of the Rings
4 Calling Birds: The Pipes are Calling
3 French Hens: Egg-Laying Hens
2 Turtle Doves: Teenage Mutant Ninja Turtles
1 Partridge in a Pear Tree: Partridge
For each of these, we take the letter given by the line number (for example in The Little Drummer Boy we take the twelfth letter, U) and then shift it by the amount given. The letter 13 letters before U in the alphabet is H, so the first line gives H.
Continuing this pattern for all twelve lines gives the answer HAPPY NEW YEAR, which is an appropriate way to end an end-of-the-year countdown.