The best replacement for more weight is more reps.

The best alternatives to more weight are rated as following:
★★★★★  more reps
★★★  less reps
★★  more repetitions
★★  better form
★★  less weight
★  reps
★  higher reps
★  reps better
  more sets
  more reps less weight

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Speaking about more weight, one probably shouldn't forget about less reps.

Other search terms related to more weight and their ratings are:
★★★★★ less reps
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more weight
more reps
less reps