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All answers having "Keep going" as clue:

4 Character Answers:

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LAST

SLOG

TEND



5 Character Answers:

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RUNON

STOKE



6 Character Answers:

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ENCORE

ENDURE

PUSHON



7 Character Answers:

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CARRYON

PERSIST

SUSTAIN



8 Character Answers:

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DONTSTOP

TICKOVER

WHATELSE



10 Character Answers:

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DONTGIVEUP

PERPETUATE

STAYWITHIT



11 Character Answers:

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DONTSTOPNOW

HANGINTHERE

NEVERSAYDIE

TRYTRYAGAIN