I wouldn't know how to give it a try. You can search the web to see if there's a workaround for Realme phones, but again, I don't think there is.
From what I can find on the web, your phone is a budget phone with low specs (3 GB RAM, 32 GB internal storage). Of that 32 GB of internal storage, it's not unusual for at least 7-8 GB to be taken up by the system itself, and if there are other preinstalled bloatware apps, that can take up an additional few GB. Then, considering how big apps are getting these days, the rest of the storage can fill up pretty quickly. The unfortunate reality is that budget phones are useful for very basic usage -- you can't expect flagship specs or performance from them. If you need more internal storage, you're going to have to consider upgrading to a higher spec phone.