(still need help) Snapped Top screen plastic but everything is working fine

[lilac seal]

The right part of my blue 3ds xl top plastic has decided to break after leaning it forwards,
I'm guessing its mainly just wear n' tear that caused this.

My 3ds xl runs perfectly fine nothing was affect. (ive turned my 3ds xl on and off so many times to check, all is good there)

The top screen has came off only once or twice years ago but with no damage and ran perfectly as normal when the top screen was put back on

I just need suggest on how and to make this more secure so I dont further damage anything (btw I live in the uk so keep that in mind if you need to direct me to anywhere etc.)

I will leave my 3ds xl alone until its safe and when I have a solution.
(sorry for the bad pictures)

I was in the middle of a game when this happened so I can vouch that it did not damage anything else.

(btw this is not the one that i had micro-sd trouble with)

[lilac seal]

Here's some proof of the screen being fine (I'm holding the top screen gently so it places itself where it would normally be)