Whenever I'm in the mood for heavy cultivation vibes and vibrant fight scenes, I look for official sources first — it just feels right to support the creators. For 'Douluo Dalu' (also known as 'Soul Land'), the most reliable places tend to be the big Chinese platforms like Bilibili and Tencent's international service WeTV (or Tencent Video when you're in China). These platforms usually host the original episodes with subtitles and sometimes dubbed versions, and they often carry follow-up seasons or side projects too.
If you're outside China, check Crunchyroll and iQiyi's international app — they've carried Chinese donghua at various times, and availability shifts with region licenses. Netflix sometimes picks up Chinese animated hits depending on country, so it's worth a quick search there as well. My usual routine is to search the show title directly on those apps or use a tracker like JustWatch to confirm what's streaming in my region. I prefer watching on Bilibili when it's available because the community comments and official uploads make rewatching fun, but whichever legal platform you pick, sticking to the official stream helps the series keep getting made and localized.
Oh, and one practical tip: search both 'Douluo Dalu' and 'Soul Land' — some services list it under the English name. If you run into region locks, consider whether the platform has an international option or buy episodes legally where offered, instead of pirated copies — the art and music deserve the support.