Instead of focusing on travel writing, much of which is about selling articles, look for ways to improve your travel journaling.
Do a websearch on the subject including Youtube videos. There are many.
One such article is from our fearless leader:
https://www.ricksteves.com/watch-read-listen/read/articles/the-zen-of-journaling
There are also a few books on the subject. Writing Away by Lavinia Spalding and Globejotting by Dave Fox. Both are older but contain some good information. See if your library has copies.
The Gotham Writers Workshop has a class on Travel Writing. It's offered both in person and as an online class. Not cheap.
https://wp.writingclasses.com/courses/travel-writing/
If you want to mix a vacation with learning, Book Passage, a wonderful bookstore in Corte Madera, CA--just north of San Francisco--holds an annual Travel Writers and Photographers Workshop. I atteneded about 25 years ago.
https://bookpassage.com/travel
When I was studying journalism, I remember my features instructor telling the class that this type of writing is nothing more than talking on paper with a little grammer thrown in. Think of your audience as saying "tell me a story."
When you sit down to write, don't expect a polished version in the first draft. You should just be getting your information down. Then go back for the polish. All real writiing is re-writing.