Buying a monetized channel sounds like a shortcut but for travel content it rarely works out imo. The old videos won't match your content and the audience isn't yours, so watch time and engagement usually tank once you switch niches. Better to build fresh honestly, especially if you actually enjoy travel vlogging.
If you really wanna buy just to skip the monetization requirements, fine, but make sure the subs and views are real and tier 1... plenty of bought channels are stuffed with junk traffic that gets you nowhere.