Water damage MacBook Air! File recovery!!

Hi there! I’ve had a nightmare and spilled a gin and tonic over my laptop. Washed it off immediately and turned it upside down and off, but when I left the room my mum turned it on again and it smelt like burning and made some weird sounds (I know it’s the worst thing she could’ve done). Turned it off after this and left it in rice for 48 hours, now I’m left with a laptop where the screen displays the red charging symbol when it’s plugged in, but I charged it for over a day and it won’t actually turn on. I’ve already ordered a new MacBook which is coming in about three weeks so I’m not looking to fix the old one. But I am a final year uni student and there’s a lot of files on it which are not on my most recent backup on an external hard drive, and I really need them to complete my degree. They’re not on my iCloud (I am 99% sure) because it’s been saying that my iCloud storage got full a long time ago and I never updated it. I’m desperate to get my files back, but I’m not desperate to spend a lot of money mending it - having already ordered a new one and spent over a thousand pounds on it. What can I do to retrieve these files when no Apple stores are open for me to take it to? Thanks - a very stressed out student who wants to graduate.