"close to my heart" is a perfectly correct and acceptable phrase in written English. It is often used to express a sentiment that something or someone is very special or important to you. For example, "My family is close to my heart and I love them more than anything in the world."
Another project is close to my heart.
a place close to my heart.
It's something that's close to my heart.
This is so close to my heart.
This issue is close to my heart.
It's always been close to my heart.
I hold it close to my heart".
It's quite close to my heart.
"It's a community close to my heart".
It's a topic that's close to my heart.
That foundation is very close to my heart.
Thanks to Ludwig my first paper got accepted! The editor wrote me that my manuscript was well-written
Listya Utami K.
PhD Student in Biology, Bandung Institute of Technology, Indonesia