How do I Invite Others to Guest Blog On My Blog?

Send an Email out to complementary websites in your niche, letting them know of the opportunity to guest post and pick up a link from your site.

tell me your url, I want to check first, if good metrics, If good metrics I'm interested to guest post on yours

Just find blogs in your niche with similar PR and send them a mail.

@afam4eva thanks for the advice. i started gathering some blogs to contact their admins

what's your niche? You can exchange your post from Forum Promotion | Free Advertising, Promotion, Admin and Webmaster Forum

They are usually exchanges like that. Hope it can help you.

People post their blogs as a guest blogger on other blog sites only if they find those sites with good values w.r.t SEO. For example, if your site has a good domain authority, no (or less than 3) spam score, good search volume and attractive design, it is easy to convince bloggers to use your blog site for guest blogging.
Well, there are two types of people who look for guest blogging, one are the real guest bloggers with an intention to increase their trust on the web as authors/bloggers, and the others are the SEO professionals who look for the opportunity to create backlinks by doing guest blogging on others websites.

You can apply the following techniques to invite others to guest blog on your blog site:
1. Forum posting: Sharing your sites link on relevant forum posts on different forum sites and asking bloggers to guest blog on your blog if they are looking for the niche/category which is relevant to yours.
2. Blog posting & commenting: You can post some blogs on different blogging sites like blogspot, wordpress, tumblr etc. where you can mention your websites niche, and you are open for guest blogging on your site, inviting guest bloggers to do guest blogging on your site. Many guest bloggers will reach your site through your blog posted on different blogging sites.
You can also do blog commenting, i.e. you will have to find blogs which details about guest blogging, and you will have to post a comment with your website link, inviting guest bloggers to do guest blogging on your site. Guest bloggers, who will be reading those blogs, may reach to your site for guest blogging.
3. Email Marketing: You can collect email addresses of guest bloggers of your niche (from Google searching, facebook, linkedin etc) and run an email marketing campaign to send invitation emails to them.
4. Social Media: Yes, social media! You can find profiles of lots of guest bloggers on Facebook, LinkedIn, Twitter, Google Plus etc, and contact them there inviting them to do guest blogging on your blog site.