Build your blog for fishing enthusiasts. Offering fishing techniques, fishing gear reviews, fishing destinations, and tips/tricks for fishing. You can cover topics catering to freshwater and saltwater fishing, fly fishing, ice fishing, and kayak fishing and beyond. If feasible, do cover areas such as sustainability in fishing, conservation efforts, interviews with expert anglers, as well as recipes around catch of the day.
This is a super specific niche with a dedicated audience. Generate profit through affiliate links and Ads among other things.
This is a theme popular among outdoor enthusiasts and hobbyists worldwide.
Blog Name Idea: MyFishingGuru.com