A definite go to promotional company for authors at any stage of their career, ENT results are consistent and above market average. Not many companies have the track record of a company like this, and the largest factor is the fact that they have a strong editorial team picking out their content.
When you submit material to promote with them, they won't just accept every listing blindly, but rather they will only invoice you if and when your book meets their standards. This serves to protect readers, because they won't be inundated with tons of offerings that simply aren't worth it. If a reader is burned by a bad recommendation even one time they can stop using an email service provider entirely.
I've run quite a few promotions through this company and always returned good results. My most recent listing was for a newly released horror novel, and even a few short days after the book came out this website returned tremendous results for me. That is why it easily garners a 5-star rating from me and a definite recommendation to use them.
They have a few different listings available, including a book of the day promotion that books months in advance. They open up listings every three months, and those slots are sold out after only a few days.
Their free or paid book promotions are almost as good and a lot cheaper options, and they return great results. Considering the price tag, this one is a must for your book promotional plan.
To compare this service to another one. OTOH books is another service I used around the same time as my most recent ENT promotion. That promotion cost about 25 times as much money as this promotion did, and ended up with results about half as good. I have OTOH books on my "never use again list" and ENT on my "use every chance I get" list.
Don't take getting rejected as discouragement. Just pick yourself back up, dust yourself off, and keep writing.