How long do your careers last?

I noticed I basically never get past the 4th year of career. Maybe that's because I have no more goals apart from winning again or doing the same matches once again hoping for a slightly different result.

I don't like starting with league two teams since I see no actual fun in having absolutely zero money or good players, but at the same time I discard careers with already powerful or wealthy teams.

I noticed that once my team wins the national league and maybe a random European tournament, that's when I stop enjoying the career.

Same happens if I win a few cups or even none, but I have a very strong team that doesn't need any more players to be bought.

That said , I have a few questions for you guys:

1. How long do you make your career last?
2. Do you actually enjoy winning more and more the same tournaments?
3. Do you switch teams without starting a new save?
4. Do you bring your teams to the point you can actually use the youth academy players as regular players?