It sounds cliche, but I think this is the best tactic I have ever used on FM20.
High scoring tactic and solid defence. I have not tried this tactic with a poor squad, but I suspect it will not be as effective and will concede alot of goals if you have slow defenders.
As my team is now up to par with most premier league teams, I change mentality according to my opponent. Try switching mentality to very attacking @home and away against the lower bottom teams. Attacking @away mid table teams and balanced when away against elite teams.
This tactic saved my season. My striker scored 30+ goals and DLP with 30 assist (he also takes all the freekicks and corners). But I am skeptical and will wait for the 2nd season results, because this tactic tends to stop working as AI change their approach due to your rise in reputation.
I don't know if this is intented, but I am trying to sign staff and all of them are asking an obscene high wages starting from 3k p/w (150k p/y). Even unemployed staff with low stats are asking those wages. Because of this, my U19 staff are empty. :(
I have plug and played from the 3rd division to the 1st division with the same tactic. At some point, it will not work as good anymore, but you just need to build a better squad, and result will come. Usually, my squad consist of 80% loan players. Quick wingers and strikers will guaranty...
I usually start unemployed and work my way to the club I want to manage (FC Andorra). Spain is my favorite league, but usually when I start unemployed it will be clubs from the 3rd league van Germany or Austria that gives me a chance.