The OP asked if there was an HTML command to make crawlers crawl their most important content first.
However, no-one has been able to offer such a solution though we have had answers concerning crawling faster, which is not the subject of the thread.

Therefore, if anyone can suggest a way to do what the OP asks, please post it.
Anyone who has any thoughts on getting crawled faster, please keep them to yourself as far as this thread is concerned.