Too Many Hashtags

I'm having a mini crisis with self promotion.
I'm in no fit financial state to plug my books left, right and centre, and throw money at advertising. Self promotion is hard, you feel like everyone is sick of the sight of your posts, that you're annoying anyone who sees it, and that it doesn't have the desired impact as you'd hope.

I've noticed this mostly through Instagram and Twitter. I don't have an official writers Instagram account, so I use my personal to attempt to post updates of my work. I do have a CC Twitter account, but I'm having no luck with it.
I am aware I use far too many hashtags - but what choice do I have? I would love it if news about my books could reach thousands of people with little to no effort, but that's not in my grasp.

If I receive news about my writing, I am delighted and want to post about it anywhere and everywhere - because I am proud of my hard work! Does this come off as arrogant? Annoying?

Don't get me wrong, this isn't a pity party -- I'm just finding it difficult as an indie author who doesn't have financial backing. You have to do whatever you can.
If you do follow me on social media, and I have done your head in with constantly getting excited over my books and writing, then I can only apologise. I do get excited about my work, and I'd like to share the good news from time to time.

I will continue to self loathe whenever I feel I am over posting, but I will also feel immensely excited about the content. I over post because I'm overly excited!

Mini rant over.