See what the community has to say about the project you're considering. The community, they have profound wisdom in many aspects.
To invest in a project need to look at the chart, consider the roadmap, white paper, backed and community support. It is important for long-term and short-term profitability that you must anticipate market trends and the application case for the project you are studying.
There are many people who got rich buying altcoins during the downtrend from 2018 to 2019. They did it because they have a good long-term vision.