Yes you can, we will charge you the difference for your current term (eg, if you have 3 months left till your next billing date, we will charge you only 25% of the new package cost and you get upgraded immediately)
Let's chat, our solution can scale to larger user but for customer of your size, we would like to find out more of your need and deliver a solution that best suit you. Send us a email at info@biszinc.com with your use case