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