Just about Finished Writing an Actual Book and Have No Idea How to Market It

What's up people!
It's been a long time since I've been on here. I started on here back in the stone age of 2010 when I was trying to do affiliate marketing and writing e-articles to build links to my keyword....oh the good old days. :-) Anyway, I let that go because I got kind of bored with it and decided that I wanted to create my own material in the self improvement genre, since I have a passion for it. I went on to start a blog at The Viable Alternative

I didn't really start taking this blog seriously until Sept. 2014, when I started posting a blog once a week until 2016, when I fell off of that and started posting one YouTube video per week up till this day on various subjects related to self improvement. I've just about finished writing a book on Self Esteem and I'm at a bit of a loss on how to market this book because I'm not well known. I only have 42 subscribers on my YouTube channel and I don't have an email capture page on my web site.

What steps do I take?

Do I create a free e-book and en email capture page that offers the e-book for free to start building my email list?

How do I get my blog out there to attract more readers and build my email list?

Do I seek to be on podcasts that where I talk about my book?

My goal is to genuinely give value so I can start attracting money. I even plan to launch my own men's underwear line and t-shirts that connects to my message, since I'm a model as well. I want to inspire people with my spoken and written word that they can build their own, but this is a little bit further down the line. In the meantime, I want to know the best way to market my book.

Any suggestions would be more appreciated.