I recommend 'Untrap for YouTube'[1] - it lets you selectively block YouTube UI elements. I use the free to redirect the homepage to my subscriptions feed and block all recommendation algorithms. Now I only see content from channels I've explicitly chosen to follow, with no algorithmic suggestions tempting me to spend more time on YouTube.
The pro version could also provide you the delayed launch that you asked for.
The pro version could also provide you the delayed launch that you asked for.
[1] https://untrap.app/