Your arena seems alright. What exactly is the problem? If you make a profit of 50k per week that means you have room for another good player of about 30k salary or maybe even a bit higher who could be the start of your team.
Having a good training program will further develop your team. Have you got some good trainees?
And what do you mean by getting massive salary players and going into debt? I think it's wise of you not to go get some 100+k salary guy at your level. However a 30-50k salary guy could be added to your squad. Maybe even make it an Australian guy for that little bit of extra Merchandise.
Crunchy! If you eat fast enough