I wouldn’t sell players now unless I need the cash to buy young FTs for the team. In fact I would buy players to fill up my bench to make money on their value gains through daily training. It will also help improve the training level faster which helps with power training effectiveness.

With regards to season end, might want to read some guides to know what are the options and what you have to do to prepare for it. Still have quite abit of time. Most important question is what kind of player are you? Do you want challenging tournaments or do you want to win it all?