RE: To preserve the sanctity of Mount Everest, should authorities frame a rule that if somebody has already climbed Mount Everest earlier, he/she should not be allowed to go for the subsequent expedition of Mount Everest?
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- Something else?
No. People, who behave properly should (and probably will) have the right to go there multiple times.
People, who left trash and waste there should be warned first (once or twice), then if they continue doing that, then they should be banned from climbing Mount Everest again (at least for a few years).
Maybe the first warning should be only verbal.
The second warning should come with a fine to pay.
For example the climber should pay a given amount of money (for example $1000 USD) for repeatedly leaving trash/waste/garbage on Mount Everest.
Nowadays the trash/waste/garbage is really a big problem for the mountain.
According to Wikipedia, "In February 2019, due to the mounting waste problem, China closed the base camp on its side of Everest to visitors without climbing permits. Tourists are allowed to go as far as the Rongbuk Monastery."
"In April 2019, the Solukhumbu district's Khumbu Pasanglhamu Rural Municipality launched a campaign to collect nearly 10,000 kg of garbage from Everest."
The authorities should also limit the maximum number of people on the mountain in a given time to avoid the overcrowdedness of the mountain, and to provide more safety for the climbers.
I think that this would be reasonable.