It's hard to imagine what life could look like in 30 years. We short-sightedly see chaos in our world, and the markets start wavering. I won't tell you what to do now. One lesson of Benjamin Graham's Intelligent Investor is that predicting the markets is futile.
A perspective beyond this current slot of time with assets steadily growing is possible. Index funds all but guarantee it. However, if you bought index funds at the beginning of 2022, you lost approximately 15%. Worst 1st half in the stock market since 1970! That's tough, but don't worry. In 10, 20, or 30 years all will be fine. Keep the longview.
I received a "C" in my only college finance class. I just wasn't that interested in a subject that mostly flew over my head at age 20.
The class consisted of watching video lectures from a reasonable, jolly Finance professor. I failed to absorb most of the lessons, grasping only enough to not get decimated by the course's mid-term and final exam.
One lesson stood out from my professor, who seemed to know his field... "Buy and Hold". Nothing revolutionary but it was the first time someone had introduced me to this simple philosophy.
Owning and hanging onto a stock usually outperforms other more short-sighted investing or trading schemes. It stuck with me. While I have my share of bad investments, the philosophy holds weight and guided me towards some profitable ideas. I continue to hold my highest conviction securities and hold small positions if I am less sure about the company.
A solid investment held on a 5, 10 or 30 year investment horizon will probably appreciate in value. Historically, this is true for many stocks. However, Graham knew investment returns may be extremely unpredictable in sure times and increasingly volatile with global tensions mounting.