It's probably archived because of the time frame. Right now, I don't know why no one has created one HOT project for Gaza. Maybe take the initiative to some HOT board member?
OpenStreetMap community
Everything #OpenStreetMap related is welcome: software releases, showing of your work, questions about how to tag something, as long as it has to do with OpenStreetMap or OpenStreetMap-related software.
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https://learnosm.org/en/ has a lot of information for beginners too.
We normally don't map situations that change fast, nor do we map regions with an active war (e.g. Gaza and Ukraine).
Even if we did, we'd have to wait for aerial imagery and satellite imagery showing the latest situation. So, I get that you want to help but it might be better to wait until the whole situation de-escalates.
What generally does HOT and what I might find useful, is to map pre-conflict imagery, to then have a historial/comparison of the situation