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Welcome!
The Global Health and Development Fund that you mentioned would be a good choice. Note that the fund's 2 most recent payouts have been related to respiratory disease including COVID-19, which fits with what you're interested in supporting (see the Payout Reports section of the fund's page).
For more COVID-19 donation opportunities, see the post Prioritizing COVID-19 interventions & individual donations.
For charities working on global warming, see Founders Pledge climate change recommendations.