You could make the ring at the end of the button bigger. Make sure the black part is still going to touch the contacts on the board. You could use card stock and glue it on.

I would check to make sure your ribbon cable is in straight. I would also check the soldering. The soldering is almost always the problem. I´m not the biggest wizard at this stuff, so it may be something else.

I would DM Helder on Discord, you may get some heat though.

The right looks like its in but on the left, the actual screen and not the board is hanging over a bit. It could be that. I know I had to wedge my screen in kind of like that.

The ribbon cable may not be in all the way or may not be straight. The sd card might be the problem as well. On the first boot of the pi, it takes a couple of minutes. So just let it do its thing and if it still does not work then try reseating the ribbon cable, then try reflashing the sd card. You ...

I don't know a lot but you could try unsoldering it and then soldering it back in. You could also try and get a new button.

Does the function/mode button work or can you press it?

Is the screen all the way in the 3d printed part. Some of the 3d printed parts where not big enough for the screen. I squeezed my screen in.
Another problem could be the ribbon cable. It could be bent or being pinched. A picture would be helpful.

I have had some problems with this as well. I don't think you can just dump roms onto the sd card by just plugging it in, it may be possible though. I have the same internet problems that you have. what I do is use two windows 10 computers. 1 to make a private hotspot and 1 to ad the roms over wifi....

I had this problem as well with the minty pi lite. I fixed it by going into the options menu where you see audio, Bluetooth, and wife. Then I went down to the part where it says update mintypi and I updated it. I hope this helps.