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I wonder if official f-droid official clients still use fixed address for repo. Back then, it just stick with f-droid.org, far from Indonesia. I also mean, try to find closer f-droid repo.
Alternative F-Droid clients usually also stick with f-droid.org eventhough it list mirrors. They seem didn't care as long it connected on ping although eventually fail on jobs.
https://marzzzello.gitlab.io/mirror-monitor/mirror/
EU too far, China usually blocked for external access, best bet US. Indonesia internet almost always round about to US 1st (Traceroute). Btw, it also why we have lags eventhough we're contacting our neighbor Singapore (like for games server).