Open a FaceBook account, put a link on the opening page of your website and on the other pages as well.
Your opening page needs to look like the opening pages of
other writers. Put pics of your books at the top, and edit out the how-to instructions in that paragraph. Everyone knows to click on a pic to navigate to other pages. No need to explain it just to fill a space.
Here is a good example of a professionally presented site:
https://www.prestonchild.com/books/series/
Check how they present themselves on their other pages.
https://www.prestonchild.com/faq/
https://www.gerrold.com/
https://www.gerrold.com/bio/
Keep your bio short and in third person.
Inviting people to email you is nice, but most readers won't. Just put a "Contact" link at the top with an email address and leave it at that. I know you would love fan mail, all writers do, but you won't get much. I'm fairly well known, with twice your traffic and got one mail last year.
For direct interaction with readers get them to friend or follow you on
Facebook. You have pics of the places you've been. Post one to FB and tell people a bit about it. Did that experience inspire a scene in one of the books?
You can promote all you like on FB, but don't overdo it. Non-stop promotion is guaranteed to bore readers.
Post positive things, be amusing, avoid vulgarity and politics, there's a lot of it already there and people want a break from it. I recommend avoiding pics of what you're eating. I stopping following an excellent writer because that was ALL she posted. Nothing about her books at all, just lunch. Stopped following another writer and real world friend because he posted 20+ times a day about every little bit of minutia that happened to be floating through his head. I doubt he had any time to write.
If you have a cute pet, include a pic now and then. Several writers do that. One of my friends puts up posts from her cat, who is really a visiting alien who is studying the strange hairless ones of this planet.
https://www.facebook.com/jodylynn.nye
Here is another FB wall to study. He has a good balance of content.
https://www.facebook.com/TheKJA
In Settings you can control who is allowed to post on your wall. I do not allow others to post on my wall, but that's my choice. I allow everyone to post comments, not just Friends. You can delete inappropriate stuff and block trolls. Your FB wall is an extension of your living room, and people generally respect that.
Put in friend requests to favorite authors also on FB and leave comments on their walls when appropriate.
NEVER post a link to your books or website on another writer's wall. That's considered extremely bad manners and is a fast way to get booted and blocked. Some idiot's response when I posted that I wasn't feeling well was to say HIS books would cheer me up! He thoughtfully included an Amazon link. I booted him so fast he felt the breeze.
Join writing groups on FB. Follow their rules. If they say no promotion, then respect that. If anyone is interested in your books, they can go to your wall and follow links from there. Join fan groups that have nothing to do with writing. They have groups for TV shows, other writers, discussion, etc. Again, don't overtly promote your stuff. You can say you're a writer when appropriate. They can visit your wall if they're curious. Have fun.
You will get the engagement with readers there, not in emails.
You can avoid FB ads by installing "Fluffbuster Purity" -- no, really -- which filters them out. FB is ALL about ads. FBP has a FB page with links. It's FREE.
I suggest not buying FB ads for your books, waste of money. You won't get it back in sales.