If you go into youtube search and start typing your tags:
You don't need the colon after Hellblade. Not sure if it's affecting anything, but it doesn't show up in search which means people aren't typing it when they look up hellblade stuff.
Better Tags:
Hellblade Senua's sacrifice is a great tag. Only 164,000 search results. So it's not too competitive. And TubeBuddy says it's highly searched.
Hellblade part 1 has 221,000 results, but TubeBuddy says it's not searched a ton.
Hellblade senua's sacrifice gameplay has 222,000 results, and TubeBuddy says it's searched pretty often.
hellblade senua's sacrifice pc gameplay has 140,000 search results and TubeBuddy says it's searched pretty often.
hellblade pc has 222,000 results and Tubebuddy says it's searched pretty often.
Hellblade playthrough has 209,000 results, but TubeBuddy says it's not searched a ton.
Bad Tags:
Hellblade senua's sacrifice part 1, hellblade senua's sacrifice intro, hellblade senua's sacrifice start, hellblade senua's sacrifice episode 1, hellblade episode 1, Hellblade senua's sacrifce playthrough, hellblade senua's sacrifice steam, hellblade steam.
None of these show up as an autocomplete term in YouTube search. Which means that no one is searching for them.
Tips:
Go to YouTube search. Type in Hellblade Senua's sacrifice, then a space. Then, go through the alphabet, and see what autocomplete comes up with.
For example: Hellblade senua's sacrifice "a" autocompletes to Hellblade senua's sacrifice actress.
OR
Hellblade senua's sacrifice "c" autocompletes to "combat" "combat gameplay" "cast" and "cheap".
Choose the ones that fit your video and also show up in autocomplete.
Also, I don't know what Dipthroughs is. Is it you? If it's not a tag related to the game, then leave it out. No offense, but no one is searching for you yet. That means it's really just wasting space in your title. Pick the best one or two tags, and make that your title. Then, work those tags into the first sentence of your description.
"King Dippy's playthrough of Hellblad Senua's Sacrifice." or "Awesome playthrough of Hellblade Senua's Sacrifice"
Then, work 5-10 other tags into your description.
"This is a Hellblade Senua's sacrifice gameplay. If you love Hellblade you'll love this Hellblade playthrough. Join me as I talk back to the voices in my head and rock the Hellblade PC version."
Also, GET TUBEBUDDY. It's free. And it's awesome.
Good luck