Both works.
DCA is a disciplined way to accumulated investment and not to time the market. It is intended to ride you through the ups and downs of market volatility. Lump sum investment has the benefit of taking advantage when opportunity calls.
In a shorter time frame, Lumpsum investor expects higher risks or rewards than the DCA investor.  But in the longer time frame, both positions should work out to be rather similar.
So invest the way you are comfortable with, as long as you have done yo...

... am just sitting on the sidelines.

My prediction is Nvidia.
Nvidia has shown impressive growth with surging demand and strong earnings reported. Its stock price has soared beyond my expectation, even though i have always known it to be a leader in AI chips.
While Nvidia has the highest potential to excel beyond Apple and Microsoft, the latter have broader product portfolios and software ecosystems, so Nvidia will need to effectively deploy its business strategy to win the race.

# Set your goals, hit the road!
1. Ventured into US stock market in year 2023 but made some impulsive investments that did not work out too well. Need to make more informed decisions in year 2024.
2. Target to improve knowledge in 2024 by setting aside 1-2hr each day to read business and investment articles to better understand market trends and outlook. Hopefully the investments in 2024 can bring about a net gain to my portfolio.
Lastly, wish all mooers a very Happy New Year 2024!