さらに (sarani) means “more” | MotiTan Japanese Dictionary

More examples

練習すれば、さらに上手になります。ren shū su re ba sa ra ni jō zu ni na ri ma su

You will get even better with practice.

Adds something beyond what is already present, often increasing an amount or extending a statement with one more point.

もっとmotto: Indicates a greater amount or degree.
もうmō: Indicates that an additional amount or item is wanted or present.

すでにあるものに別のものを加え、数量や程度をいっそう増すさま。su de ni a ru mo no ni betsu no mo no o kuwa e sū ryō ya tei do o i ssō ma su sa ma

The adverb さらに (sarani) comes from 更なり (saranari), an older native form meaning "further," with に (ni) as its adverbial ending.

Before a quantity, さらに (sarani) often means "one more," while at the start of a sentence it commonly adds a further point.