Hey @RedoniHunter, thanks for replying. ItchIO Admin are able to do Tag Merges; it's been done before, my friend.
Tag Merge process is in this Admin thread: Tag merges and suggestions - Feature Discussion - itch.io. The Admin @leafo has done merges over the last year.
Merging a tag will update the taggings of any projects that use the old tag, additionally if anyone in the future tries to use it, it will automatically be renamed to the merged tag
My recommendations above are based on the ~615 Tags that we can see on https://itch.io/tags page as well as the drop-down tags menu in the upper right-hand corner.
The All Tags page and the Drop-down doesn't truly show every single tag. But is it the first and only tag listing the average user runs in to, so it makes sense to actively clean up what we can see and optimize with merges along the way. Especially since it's also linked as "View All Tags" in the Browse Project / Games Search Bar. :)