The only thing that troubles me about your multi-blog experiment is authenticity. You said that you will follow up your travel blog with a mental health and a gaming blog, looking for the niche that makes money.
But as a reader of gaming blogs, I know that I need authenticity to stick around. I have to feel that the blogger plays a lot of games and has done for many years. I need to read the little details that stick out when someone really knows and loves a game.
That said, if you love games and pour that love and passion into the gaming blog I’ll definitely be your first reader.