To get a comprhensive and upto date overview for the lab leak theory and its evidence I would recommend reading the following four long form articles in order (primarily to get good context on how the narriative has evolved).

As background:

[1] Jan 2021 - Intelligencer: https://nymag.com/intelligencer/article/coronavirus-lab-esca...

[2] June 2021 - Vanity Fair:
https://www.vanityfair.com/news/2021/06/the-lab-leak-theory-...

[3] Oct 2021 - New Yorker:
https://www.newyorker.com/science/elements/the-mysterious-ca...

[4] Feb 2022 - Inference Review
https://inference-review.com/article/thunder-out-of-china

The points presented in these articles are all thoroughly well researched and balanced. IMO the points and facts raised taken in a mosiac paint a palpable picture of events.

From the last articles conclusion:

THE CURRENT SARS-CoV-2 pandemic has been, and continues to be, a public health catastrophe—the most serious in a century. Questions about the origins of COVID-19 are, at once, matters of legal, financial, and moral concern. For the moment, researchers can do no better than to hope for an inference to the best explanation; and, for the moment, the best explanation seems to be that the virus escaped from the WIV.

The WIV was the biggest transporter of viruses to Wuhan from all over Asia, including many SARS-like viruses from Laos and Yunnan. Phylogenetic analysis shows that the SARS-CoV-2 outbreak was perfectly localized in Wuhan, as all strains that have been found in other locations are descendants of the Wuhan strain. Had the virus been circulating undetected in other parts of China, virologists would have eventually noted those pre-Wuhan strains and their descendants in the phylogenetic tree. Even after sequencing over six million SARS-CoV-2 genomes, no evidence has been found of pre-Wuhan SARS-CoV-2.

Not only was the WIV the biggest reservoir of SARS-like viruses in Wuhan, if not the world, its scientists were engaged in creating novel SARS-like and MERS-like chimeras and potentially supercharging their transmissibility and pathogenicity. With these circumstances in mind, consider the following facts:

Shi and Jiang were experts in spike protein cleavage and were working on a pan-coronavirus therapeutic to inhibit post-cleavage fusion of the virus with cell membranes.
Jiang had previously created a novel furin cleavage site via a 12-nucleotide insertion, though not in a coronavirus.
In a joint grant proposal the WIV and EcoHealth submitted to DARPA they suggested creating novel human-specific cleavage sites.
Taken together, these points make the 12-nucleotide insertion that has created a novel furin cleavage site in SARS-CoV-2—so uncharacteristic of SARS-like viruses—look extremely suspicious.

The behavior of the WIV and its scientists also raises any number of troubling questions. The viral strain RaTG13 is a case in point. First collected by the WIV in 2013, RaTG13 was sequenced in 2018, but not disclosed until after the SARS-CoV-2 outbreak. In their initial disclosure, the WIV failed to mention how or when they came to possess RaTG13, failed to indicate that it was previously called Ra4991, failed to cite their own 2016 paper first mentioning it, and seemed to imply that they only sequenced the sample after the outbreak. This does not seem like the behavior of scientists trying their utmost to establish how a Laotian or Yunnan virus came to cause an outbreak in Wuhan.

None of these points is in itself conclusive, but the circumstantial evidence is more suggestive of a lab leak than an act of nature.

There is an additional reason to take seriously the question at hand. It is prophylactic. Knowing at last that COVID-19 had its origins in the WIV would go some way toward enforcing a worldwide ban on gain-of-function research—research that is almost as useless as it is dangerous.