If you want to make travel vlogs, there are two good directions you can consider.
First, you can do affiliate marketing for travel-related products, such as backpacks, suitcases, and other items people commonly need when traveling.
Second, and I think this is quite a good option, you can make reviews of tourist attractions and restaurants. Since you’re still new and don’t have many followers yet, you should look for newly opened places and approach them directly to ask if you can make a review. They may offer you a significant discount, and sometimes even let you visit completely for free.
Once you build up a decent following and have some influence, many tourist attractions and restaurants will start reaching out to book you for reviews.
The most important thing is to always be honest and genuine in your work.
Since you’re just starting out and don’t have a large audience yet, I recommend focusing on places that have just opened. You should also study creators who are already at the top of this niche and see how they create their content, attract viewers, and grow their audience.