Easier said than done:
Something is hard to do even though it seems simple when you talk about it.

Examples:
1 - Mark listens to audiobooks during his daily commute, enjoying literature while avoiding traffic stress — killing two birds with one stone.
2 - Mia combined her business trip with a vacation, exploring a new city while attending meetings — killing two birds with one stone.

People Person:
A people person is a person who enjoys being with other people and is good at working with them or talking to them.

Examples:
1 - She's a real people person and makes friends easily wherever she goes.
2 - She's always been a people person which makes her perfect for a job in customer service.

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Procrastinate: To delay doing something, often because it seems difficult or unpleasant.

Examples:
1 - I always procrastinate cleaning the house until the last minute.
2 - Don't procrastinate paying your bills; it can lead to late fees and a bad credit score.

Ambitious:
Having a strong desire to achieve big goals or succeed.
An ambitious person really likes to become successful and does his or her best to achieve big goals.
Examples:
1- She is very ambitious and dreams of becoming a CEO one day.
2- The ambitious student set a goal to read fifty books by the end of the year.

Altruist
Someone who selflessly cares about the well-being of others and often acts to help them without expecting anything in return.
Examples:
1- Princess Diana was known as an altruist because of her kindness and charity work. She always helped poor people and supported people with AIDS.
2- As an altruist, she donates clothes and blankets to homeless shelters every winter.

Serendipity
Serendipity is when you unexpectedly find something good or pleasant without actively searching for it.
Examples:
1- Receiving a dream job offer during a random chat at a party was a life-changing moment of serendipity.
2- It was pure serendipity that I found my old friend in a city so far from home.
3- It was pure serendipity when I found my lost earring while digging in the garden.

Idiom: A Blessing in Disguise
Examples:
1- Losing my job was a blessing in disguise. It pushed me to pursue my passion for photography, and now I have a successful business doing what I love.
2- My car breaking down on the way to work was a blessing in disguise. While waiting for a mechanic, I met an old friend who offered me a better job opportunity.