You are pretty much set my friend. You got better infrastructure already then a lot of Division 1 teams that haven’t been around for ages. Only last investment that’s really worth it could be getting the gym to level 3 if you are training some serious prospects and they are younger. If not then you don’t really need it as the bonus training gains become marginal.
There’s mixed opinion on TV & Radio station. Some say it’s good to have it if you are tanking or just losing a lot of games as it suppose to help with attendance. The higher the level the more it suppose to help to counter the loss’ negative effect towards fan attendance. I haven’t seen exact date that showed what those numbers are, but people who have build it do say they see some difference. I know a good portion of top managers don’t have it and do just fine, so I think it’s more situational then a must.