Drop Sets are a fantastic option to further fatigue & extend time under tension of a specific muscle group. They’re great for increasing Muscle Mass/Hypertrophy, Strength Endurance or even Maximal Strength.
Here are some ideas and some of my favourites to help add some variety to your training
Descending Singles: Perform 5-10 single reps, starting very near to your 1RM & drop 2-5% for each rep.
X-Rep Drop Sets: Perform 4-8 reps, then on the last rep perform X-Reps, drop the weight 10-20% and repeat.
Nasty Drop Sets: Pick 2 x exercises with different/opposite strength curves, superset them & perform a drop set on both exercises.
Eccentric Japanese Drop Set: Perform 5-10 eccentric only repetitions, then reduce weight and complete as many as possible with desired tempo. Keep reducing weight until 25 total repetitions are completed.