A good rule of thumb is to check either the username and/or handle. I use these following usernames and handles predomiantly:
Main Channel (@thanyawatsrivajana) - This is where I upload most of my videos.
Second Channel (@thanyawat2554plus) - first came thanyawat2554, now comes thanyawat2554plus.
Roblox (@thanyawats) - Yes, Why wouldn't I link this if I was a Roblox youtuber mainly?
Tumblr/Tumbler - I either hate this site or enjoy devouring everything that happens in here.
Blogger - funny stuff and general blog posting
Bluesky/bsky (@thanyawats.neocities.org) - So you could technically link your neocities domain? cool!
Discord (@thanyawats) - Well, I wonder if we can actually link profiles here.
Twitter/X (@thanyawat2554) - It's just rocket science.
Instagram (@thanyawats/thanyawat2554) - I seldom use this
Threads/Fediverse (@thanyawatsrivajana@threads.net) - I seldom use this thing
Reddit (u/thanyawat2554) - Not as good as before but I kinda dig returning tbh.
GitHub - What's this for again? yeah i used to host a github sites site but i don't now
Bento - The more artistic yet immature brother of this site.