Meaning trap
slow down
become less active
To do things at a more relaxed pace, or to become less busy or energetic.

Don't mix these meanings
Same phrase, different job.
To do things at a more relaxed pace, or to become less busy or energetic.
Another meaning of 'slow down' is 'reduce speed'; compare the examples to keep the meanings separate.
Hear it in context
Notice where the phrase sounds natural.
After working so much, I realized I needed to slow down and take care of myself.
Many people believe that it's important to slow down and enjoy life rather than always rushing from one thing to another.
Fix the pattern
One small grammar move makes it sound right.
Not: I need to slow down my life.
Say: I need to slow down a bit.
In this sense 'slow down' stands alone — no object like 'my life'.
Which sounds natural?
Tap the one a native speaker would say.
'Slow down' captures easing off the pace of life in two words; the formal version reads like a mission statement.
Build natural chunks
Words that usually travel with it.
slow down + life
- a bit
- as you get older
- after retirement
- and relax
Don't confuse it
Related
Other meanings and phrases to compare.
- slow down (reduce speed) — Another meaning of 'slow down' is 'reduce speed'; compare the examples to keep the meanings separate.