Start with Phantom Menace and remove all childish stuff + badly acted scenes.
No Jedi droid slashing, no underwater sequence, no extended mother goodbyes, etc etc.
Remove Jar Jar, Anakin and the Droids “funny” noises.
And above all, make Anakin go on the final attack intentionally!
Aim for a 1H30 movie.
Those changes are easy to do and will put you into a more “radical” frame of mind.
The other movies are harder to tackle thematically. So warm up on TPM 😉