Hey! I get that you want a quick indexing method, but you should be careful with overly fast solutions. Some methods could be risky and cause long-term issues.
To speed up indexing, one thing you can do is use Google Search Console to directly submit your URLs to Google, which can work pretty well in a short time. There are also tools like Ping-O-Matic or Linklicious that some people use to try speeding up the process, but it’s not always guaranteed to work in every case.
As for the XML method, if it’s not working for you, it might be due to the setup or the type of links you're trying to index. In any case, I recommend focusing on a natural, high-quality link building strategy, as it’s always more beneficial in the long run.