The best replacement for more reps is more weight.

The best alternatives to more reps are rated as following:
★★★★★  more weight
★★★★  less reps
★★★  more sets
★★★  heavier weights
★★  weight
★★  more weight less reps
★  sets
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Speaking about more reps, one probably shouldn't forget about less weight.

Other search terms related to more reps and their ratings are:
★★★★★ less weight
★★ lighter weights
★★ lighter weight
★ lower weight
★ light weights
★ lighrer weights
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more reps
more weight
less reps