Use a quick fill‑in formula so you do not start from zero each time.
Template:
“Happy Valentine’s, [name]. Thank you for [specific thing]. You mean a lot.”
Examples:
“Happy Valentine’s, Sam. Thank you for your memes. You mean a lot.”
“Happy Valentine’s, Mom. Thank you for your calls. You mean a lot.”
You only change the name and the middle part.
Keep the whole line under 75 characters by counting once, then adjust words.