Here are some tips on how to choose effective blog topics –

Write on topics that you want to share knowledge with your audience. Try to give valuable information to your audience through content strategy
Check what your competitors are writing about
Write on relevant & fresh topics (not things from past)
Use Google RTS (Auto-fill feature in search engine) / Related search suggestion on bottom of SERP for content writing idea in your domain
Use Google Trends
Check Buzzsumo. It’s paid tool but still can explore few useful features
Check answerthepublic.com. It’s a free tool you can use for content idea
Other tools (paid ones) you can see – ahrefs.com, semrush.com
https://www.hubspot.com/blog-topic-generator
https://www.portent.com/tools/title-maker
You should focus on curated lists, power word titles and as well as Evergreen content.