a lot of the issues may be that you only have 64GB of Memory on a Xiaomi Redimi, and only 128GB if you got the higher end Xiomi 10.
For your low performing phone. I'd recommend turning off Any additional background apps, And turning on Power mode on your phone
((make sure your not in Battery saving mode))
If Discord is open on your phone, in the background, Close it, It does eat up most of your memory.
Click the ||| on the bottom of your phone, then click "Close All" then try to run the game again.