"I sincerely appreciate it" is a correct and usable phrase in written English. You can use it in a variety of situations, such as when someone has done something for you and you want to express your gratitude. For example: "Thank you so much for helping me with my project - I sincerely appreciate it.".
To those who did something creative I want you to know that I sincerely appreciate it.
I sincerely appreciate it.
"You'll always be in my heart, and I sincerely, sincerely appreciate it.
We sincerely appreciate it.
If so, give it to them- they'll sincerely appreciate it.
I truly appreciate it.
She wrote on Twitter and Facebook: "I sincerely appreciate all the kind words and support.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK