Another thing they can try is this, adding new engine swaps to pre-existing cars and not all of them being better/more powerful options.
Don’t get wrong, some of the swaps some cars get currently are absolute wonders, but there’s plenty of potential out there AND potentially less work needed to do so.
For example, Ford Mustangs could get the Turbo 2.3 Ecoboost from the Focus RS as an option.
And if adding engine swaps retroactively is sounding like something they haven't done before for Forza, they actually already did so on FH5. 🧐
Both the Forsberg Racing Toyota Camary 2JZ Nascar and the Lancer Evo Time Attack had engine swaps added to them long after they were added, The Racing 7.2 V8 for both cars, plus the 1.6 Turbo Rally for the Evo.
Could even include them in a theme for each Series Update. 👍