keep at it (?.)

• carry on
• continue
• endure
• get along
• get on
• go on
• go on with
• hang in
• hang tough
• keep at
• keep busy
• keep driving
• keep going
• keep moving
• keep on
• keep trying
• keep up
• last
• make out
• manage
• never say die
• not accept compromise
• peg away
• persevere
• persist
• plug away
• see it through
• stick it out
• stick to it
• survive