Here’s another interesting article: ‘The dream has come true’: Standard model of cosmology holds up in massive 6-year study of the universe — with one big caveat
The ideas in this article are based on a huge amount of work. The Dark Energy Survey has analyzed 1/8 of the sky (670 million galaxies) using the Victor M. Blanco Telescope in Chile over a period of six years.
The findings support the standard model of cosmology, but only barely.
The main problem is that the universe looks less clumpy than the standard model predicts. At the same time there is a host of alternative models that fit the data equally well.
Other problems are that some measurements of cosmic expansion don’t agree with others, and galaxy surveys and early-universe data don’t exactly line up.
Alternative models consider that maybe dark energy changes over time or interacts in subtle ways, or gravity behaves slightly differently on cosmic scales, and so on. Alternative models fit as well as the standard model and they manage to explain the clumpiness issue better.