Looking for advice on jobs I can learn the most sales to build my own business

Hi guys!

I am in the very rudimentary phases of building my own business and am looking for advice from any and all of you who may have done the same in your careers. Currently I'm about 1.5 years into my first office job (blah) and am only doing it to learn sales/the corporate and business world so I can then translate and use the knowledge and skills gained for growing my personal business and my own company (wellness industry).

I have a 3 year timeline of staying here to learn as much as I can while I start working on a business plan and all the other things I need to do to start creating my company. The company I currently work at (sales for recruiting firm) I do not do demo's or presentations or anything like that. I'm pitching and cold calling hard, and have been very successful shooting the shit with hot shot CEO's of many Fortune 500 companies. However, product demo's and presentations will be my prime way of building my own business and am starting to think I should switch jobs to gain that side of the sales experience. Should I be at a company that I can learn this skill or should I be going full send into the unknown with the strong sales accumen I'm acquiring in what I'm doing now?

Any other tips on starting businesses is appreciated!