My website is the most copied website nationwide.

Has anyone used Shopify to build their own STR property website?

once Ive run out of blog topics, can I just rephrase old topics, also I literally just rephrase other people's blogs because I can't make my own, I just copy and paste into a website and it rephrases it for me and I copy that and add a picture and that's all I'm doing for my blogging, is it enough?

You could certainly reach this demographic, but it could also cost you substantially more than the return.For the money, your best bet is probably a dedicated website for your property with the key words that you want to convey.

Our website was just OK, our email campaigns were hit and miss, our conference presence was fairly minimal. 

I think Cozy will also work I just prefer the look and feel of the Simplifyem website better.

We take ID's for all guests (in a website called Chekin) so would have documentation the booking guest is above 21.

I have no experience with this group but just visited their website. 

I'm currently using a website that I created 4 years ago, posting vacancies by creating a page and cross linking it to a form in my website for applications.  

My bet is you do not get sued.