:salam2: Sister
As far as I know, You will definitely get the ajr and benefits of gaining a deeper understanding from reading The Qur'aan in English or any other language (if you cannot read in Arabic) but it is mandatory to be able read the Arabic script in order to receive the full thawab (as far as my limited knowledge goes) and Allah knows best. I hope someone else is able to provide you with a more detailed answer inshaAllah. I myself am only able to read the Arabic and understand only some of it, in the processing of learning Alhamdulillah. Best of luck to you!
:salam2: