Torn signal anetenna cable/ homebutton not working

I have a kind of my own project ? i bought Iphone 7 128GB for 80euros on facebook market and i wanted to fix everything on it so it would be as new.

I had 2 problems with my phone , the small speaker was playing quietly, big speaker was also little quieter and the battery was 79%.

BATTERRY REPLACEMENT WENT FINE

3mins tutorial on yt, i have done it couple times on my older iphone 6 and 6s. Everythink OK

SMALLER SPEAKER REPLACEMENT

I bought some tools on internet for 5euros.

I got another small speaker from my brothers old iphone 7 that wasnt working properly but the speaker was fine.

I followed tutorial on yt and everything went smooth.

I started the phone and find out that homebutton is not working completly.

Went to the small servis and i gave alredy opened phone to the guy. He looked at the cables that connects screen and motherboard and told me i chipped a little bit of the cable, probably when i was closing the phone after the small speaker replacement so that caused the homebutton is not working

He told me i could use the display with homebutton from my brothers old phone wich was fine.

I decided to take the big speaker from brothers phone and replace it too.

So when i was putting the big speaker inside, i accidentally ripped the cable/antenna out of the motherboard.

So i connected only the wifi cable and putted everything back together.

Started the phone finding out the homebutton is still not working and phone cant find signal but rest worked normaĺly.

So my questions are

1. Is it possible to solder the antenna cable back to motherboard ? and how much it would cost for the work in servis? I live in Czech Republic, Europe, you pay here like 40euros for battery replacement on iphone 7.

2. What could be the problem with homebutton?

I read that i could reset my phone completely and it could work again but didnt tried yet. Tried only the hard reset volume down and power button but it didnt work.

Thanks for any suggestions and sorry for my english ?