1. the project runs according to the roadmap and whitepaper that has been made;
2. cryptocurrency that we invest in already has a product;
3. the team always updates about the progress that is happening in the project that we invest;
4. invest in project that are in the top 1-500 in coinmarketpcap (have a high volume);
5. the project we want to invest has been running for a long time (if I personally never invested in a new project), because investing in new project has a greater risk than we invest in old project.
yes I agree with some of the things you mentioned are safe ways to invest in crypto and this can minimize the risk of loss. I also never invested in a new project because some of the new projects were a scam, they just wanted to raise money and then leave. it's better to invest in an old project that already has a trusted and experienced dev and development team. and of course we must always do research before investing.