Hope you're doing well.
Read this very interesting article that may help you with the queries you are having on sales and increasing traffic on twitter.
The basic summary of this article, as I contemplated them to be are :
1. Build your followers on twitter - You need to target and focus on the niche of products that you are selling and engage with your followers to get more clicks and traffic on your pages and website. There are a few softwares also that may help you into doing the same. For example - https://www.simplycast.com/software/twitter-automation/
2. Influencers ( Identification and engaging ) - Find influencers in your field, engage with them (retweet their posts, comment on their posts) and try and get their audience to engage with you to improve traffic.
3. Right Hashtags - Twitter is all about hashtags, you must use the right hashtags for visibility and getting your tweets in front of more people. Also, there are many tools available for you to identify the tags you should be using to target the right audience for you.
Also, I would recommend you to read an article which shows how to go about working on twitter to increase sales and your presence for a week that should drastically improve your traffic.
I hope my thoughts would be of help to you.