Burning the midnight oil
Staying up late to work hard.

Where there’s a will, there’s a way
If you are determined, you can find a solution.

Keep your eyes on the prize
Focus on your goal.

Don’t give up the ship
Do not abandon your efforts.

Pushing the envelope
Going beyond the limits of what is considered possible.

Bite the bullet
To face a difficult situation bravely.

The sky’s the limit
There is no limit to what you can achieve.

Hanging in the balance
Being in a situation of uncertainty but still trying.

Fight tooth and nail
To fight very hard to achieve something.

Take the bull by the horns
To confront a difficult situation directly.

Onward and upward
Moving forward with determination.

Stick to your guns
To remain firm in your beliefs or decisions.

Going the extra mile
Making an extra effort to achieve a goal.

Nose to the grindstone
Working hard and diligently.

In for a penny, in for a pound
If you're going to commit to something, go all the way.

Digging in your heels
Stubbornly refusing to change your mind.

Weathering the storm
Enduring a difficult situation.

Turning over a new leaf
Making a fresh start or changing for the better.

Keep your chin up
Stay positive and remain determined despite difficulties.

Making a mountain out of a molehill
Exaggerating a small problem into a big issue, but still determined to overcome it.