If the plan is to get deported then by all means, make videos of cops in Thailand that portray them in a bad way!
Also, if you don't know what you want to vlog about then how is this endeavor ever supposed to be successful?!
Making it on youtube is pretty, tough, these days.
The one thing a lot of people seem to like are pranks. You could do that with your better half, if you have one, or a buddy.
My recommendation is, to find one thing you like yourself and just keep doing it and upload regularly. If you're lucky one of your videos goes viral and that could be the beginning of your channel taking off. But even then, it's most likely not gonna happen and if it does, it's most likely gonna take years and years before you can live off it. There's also a ton of rules you have to comply with in order to get monetized.
If you live in Thailand there's so many things to film. And yeah, there's a lot of travel channels, but it could be Thailand through your eyes, the off-beaten path. Show them the places YOU like, places tourists normally don't get to see because they stick usually to the known attractions. Do your research on these places, mention the information in the vlog and pair that with nice videography and some relaxing music.
You also have the option to just record your opinion on current affairs, if that's your thing. Have a discussion about Trump with a buddy that has an opposing opinion to yours. It wouldn't even have to be politics or exclusively politics, just whatever is going on in the world at the time. You could do that on top of travel vlogs ir literally anything else. The world is your oyster, man!
Finally, if you want to upload once a week for example, be prepared for this to turn into a full time job because you'll have to edit the videos and that takes forever! Especially, if you choose longer format videos over short format.
In regards to equipment, yes you can use your phone to record, a lot of people do, but if you want to film when it's dark also, you need a light, and you will definitely need a computer and lots of external hard drives, especially when you want to film in 4K. There's tons of videos on vlogging equipment on youtube.
One more idea, just go and interview expats on what made them move here, what their lives are like here now and how they feel about living in Thailand, what the up-and downsides are. You could even develop a questionnaire and ask everyone the same questions, like Lipton did at the end of the Inside the Actors studio episodes, and don't be shy to put in some silly questions as well that will get funny responses .