As you're already utilizing inbound marketing (while having a dedicated Sales person), here's what I'd ask about your current inbound marketing strategy:

1) Are you split testing your current landing pages and other assets?
2) What is your current conversion rate for your landing pages, ads and lead magnets?
3) From where are your current leads coming from?
4) Are you running any paid campaigns currently?
5) Do you have a content marketing strategy in place?
6) Have you created an automated system so your Sales person can just focus on responding to leads and converting them to actual customers?

With those questions in mind, you can outline your current inbound marketing strategy and create new goals and KPIs based on the answers from questions above.

When it comes to your Sales person, I'd propose utilizing his time in 80:20 ratio which would be split between direct sales and improving your current inbound marketing procedures. He can work with an in-house Copywriter or Content Writer to improve your sales copy and CTAs for all your marketing assets, including email marketing assets as well.

On the other side, if you do decide to use GrowBots, I'd still propose to first improve your current inbound strategy and then keep focus on the 80:20 ratio which I've mentioned above.

I hope that helps. Feel free to let me know if you have any more questions.