What steps can I take if a specific manga source in Tachiyomi is constantly blocked by Cloudflare?

First, try using the WebView login feature for that source. If that doesn't work, clear the cache and cookies for that specific extension (or even all Tachiyomi data if necessary). Check if there's an updated version of the extension available, as developers often push fixes for Cloudflare issues. You might also want to try different network connections (e.g., mobile data instead of Wi-Fi). If all else fails, consider using an alternative extension that sources from a different website for the same manga, or report the issue on the Tachiyomi Discord or the extension's GitHub page.