1) Optimize: automate. Replace (part of) yourself with very small shell 
scripts (http://www.hilarymason.com/blog/ignitenyc-how-to-replace-yourself-with-a-very-small-shell-script/).

2) Scale vertically: become more efficient. Experience and training can 
help you perform the same tasks faster.

3) Scale horizontally for writes: shard. You can either delegate 
subtasks to others (divide and conquer / master-worker style) or just 
split your work between people at the same hierarchical level (my 
favorite solution, but remember collaboration is hard - graphs are 
inherently more complex than trees).

4) Scale horizontally for reads: add redundancy. Teach others how to do 
your job. This also increases availability and tolerance to failure by 
augmenting your bus factor.