"Over supplying a route?" is not a complete question.You have to be detailed about what you want to know.I had to find out what may be your problem by searching through those of your airline dates that I can see.People who donīt play BW canīt do this at all and will not answer these questions.
Massively oversupplying a route is against the game rules and limit must be obeyed. Otherwise you will loose those routes.
In assuming that routes will "pick up" (?) you are expecting that any plane will fill up over time/with marketing. It will see better acceptance of customers, but only up to the limit of general demand or a bit more, if you are cheap enough. You canīt push demand dates by anything you do, your aim should be to get as much PAX of those who want to fly(route demand).You are acting against those rules also in Ibiza,Valencia,New York.On the other side you leave demand unserved.You have still possibilities to serve some of your destinations at least twice, which would be much more economical than constantly opening up new destinations.Also some of your flight times need a second look, starting at midnight and landing at 3 AM will attract only few PAX or needs a very low fare,which hardly covers the costs.
If you stay within the limit of 200% supply the best occupation rate with optimal CI/RI/price/flight time/seat quality will be around 50%, again hardly covering all your costs.
Before ordering new airplanes you should have an overview of the possible routes you want to use it for.Ordering a widebody because you see just one route you can use it for is bad management.In your case there is no route to fill a widebody aircraft at all. Obey fleet commonality, otherwise your airline wonīt be successful.
I would like to ask you to learn more in the various beginner tips and FAQīs provided in this forum.