I use tags and hash tags. And my views ride the roller coaster daily, it's almost impossible to anticipate anything. Overall my channels are growing at the same speed as they were 5 months ago when I first started.
Organic reach always drops over time across any platform.
You used to get tons of likes/engagement on FB, you're lucky to get 1-2% of your followers to see your updates now. Likewise on IG, I used to get 10,000-15,000 likes on a post just one year ago, but those days are gone and I should be happy to get 5,000-7,000.
Has the efficiency of those tools changed? Sure has. How much? No idea.
HOWEVER, I would definitely continue using all the necessary tools available on the respective SM platforms to make it as easy as possible for the algorithms to find my content & present it in front of the correct audience (ie hashtags, tags, SEO, optimise title, thumbnail, description, etc).
What's the other option? Stop using tags cuz there's some article or talk that they're not as efficient anymore? Next month, it'll be something else that's working less than before, and one ought to stop using that as well?
Where to get subscribers? That's the $32,000 question, isn't it?
Besides doing long-form video content on YT, given the enormous emphasis on YT shorts nowadays, you owe it to yourself to at least try it out for, say 30 days, and see what result it'll give...there's a VERY good chance your channel views will skyrocket!