The temperature had dropped too low for heavier elements to develop by the time helium could survive.
A bottleneck in the Big Bang nucleosynthesis, the lack of a stable nucleus with 8 or 5 nucleons, led to the production of extremely few nuclei of elements heavier than lithium. The quantity of lithium-7 created during BBN was likewise constrained by this deficiency of bigger atoms.
The only elements existing in the early cosmos were those that were generated at the time of the Big Bang: hydrogen, helium, and lithium [2]. All of the additional heavier elements that are currently found in our environment were created later via nucleosynthesis inside of stars.
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