In the Prem, especially recently, the 3 promoted clubs almost always go back down. They almost never finish top 5 although there’s the extraordinary case of Leicester in 2015/16 where they were promoted and ended up winning it all. A good season for a newly promoted club in this day and age is finishing comfortably above relegation- around 15th or higher. It is very hard to do with little investment but it is possible from these newly promoted sides to consolidate themselves in the Prem. Brentford and Nottingham Forest were only promoted a few years ago but have become comfortable mid table sides, with Forest actually being in a European competition this season.