Hi @adewuyiadebayo
To increase the storage in the phone insert a micro SD card (up to 512GB capacity) into the phone and then move your apps/personal data etc from the internal storage to the SD card.
Here's an image that shows how to insert/remove and format the SD card that may help.
[image|3069433]
(click on image)
Here's the [https://downloadcenter.samsung.com/content/UM/202103/20210317153816590/SM-A022_M022_UM_SEA_QQ_Eng_Rev.1.0_210224.pdf|user manual] for the phone that may also help.