I love to make Dua in Arabic in Sujood but I fear my prayer might not be valid since I know a bit of Arabic like certain phrases and grammar but I am not fluent and am more comfortable in making dua in english. Is it allowed for me to make dua in English in Sujood entirely ? Jazakallah Khair

First, be at ease: making dua in sujood in a language other than Arabic does not make your prayer invalid. The rule is this. Whatever dua you are able to say in Arabic, say it in Arabic, and whatever you genuinely cannot express in Arabic, you may ask for in your own language. So if you know a dua in Arabic, use the Arabic, and if there is something specific you want to ask Allah, the Exalted, for and you do not know how to say it in Arabic, you may say that part in English. This applies in both the obligatory and the voluntary prayers, and do not fall into waswas about it.