I created an account and looked around. I noticed you have 3 theme.liquid files.
I see you edited the header part, so I think you removed some crucial parts. If I were you, I would swap the header/menu part back from the original Theme file and see if its works.
It's only 2min work.
Really? what's your rate? I could use outsourcing that accepts blind work.
Reigo If you need this professionaly looked at and underlying issues addressed send me an an email for an estimate.(email in signature)