I have diven very deep into Islamic philosophy for the past year and I feel like the amount of knowledge I can deduce from my own rational on my own is becoming very limited

Is there any simple English book or any specific way I can continue my journey on seeking the knowledge of Allah swt, specifically when it comes to do with the study of kalam and arguments for his existence

I recommend these books:

https://www.al-islam.org/discursive-theology-volume-1-ali-rabbani-gulpaygani

https://www.al-islam.org/al-tawhid/general-al-tawhid/selection-glimpses-nahj-al-balaghah-murtadha-mutahhari

https://www.al-islam.org/al-tawhid/vol3-no2/introduction-ilm-al-kalam-murtadha-mutahhari

I also recommend taking this class:

https://hujjahseminary.com/Courses/Course/1014