The prevailing opinions in the past have been that it's fine to post links to your own material, provided it's relevant, and you don't swamp the site by posting lots in quick succession. If it's relevant, interesting, insightful, and/or useful, then it doesn't matter if you wrote it, or you found it somewhere else.

Try posting one and seeing if you get any response.

If you're really looking for insight and engage (discuss, respond) it should be OK. If you're just submitting every blog post for marketing like (random examples) https://news.ycombinator.com/submitted?id=vijaygirija, https://news.ycombinator.com/submitted?id=Lemeowski13 then it gets boring really quick.

I am looking to share some of my idea such as https://medium.com/@lalwani/what-should-microsoft-do-to-save... to get insight on my thoughts... Plus it may help someone to get ideas for the business.

There are blogs that lack of comment section and put "discuss on hackernews" instead.

Yes, you can post your own stuff here. I have done so, with mixed results. It might help if you participate in the community a bit first. I don't mean you have to in order to be allowed to post, I am just saying that participation can help you get a better feel for what flies here.

Even if you do get that feel, there is a lot of random chance involved in what does well. I have written some on my blog about that if you care to read it.

Best of luck.