This is the 11772nd most frequent Turkish word.
gelişimin
"Development" or "growth" (possessive form: "my development/growth").
The word 'gelişiminle' combines 'gelişimin' (your development) with the instrumental suffix '-le', denoting accompanying circumstances.
Sana gelişiminle ilgili bazı öneriler vereceğim.
I will give you some suggestions about your development.
The word 'gelişimin' means 'your development' in this context, serving as a noun with a possessive suffix to indicate possession.
Gelişimin benim için çok önemli.
Your development is very important to me.
Here, 'gelişimin' is used similarly as a possessive noun referring to the subject's progress or development, with the possessive suffix indicating it.