Keep going, I still think you can do it. I started a 2nd team on my phone where I don't use any offers or such, failed to gain promotion the first season as I started in week 16-17 and finished 8th.
I won the 2nd season and secured another win in season 3 the other week and will play in the Champions League-final tonight. It's possible, although much depends on the quality of your opponents, I went without points-loss all the way until the 20th week.