It’ll help to be able to describe your audience as specifically as possible. Are they generally male? Female? Any distinguishing interests, like is it a lacrosse account or something?
When you approach potential sponsors to work with you you’ll want to be able to tell them who they can reach via your channel, and knowing that will guide who you approach as well.
For example, if you’re a bow hunting channel with 100,000 mostly male hunters between the ages of 16 and 30, you’re not going to approach Bath & Body Works to advertise on your channel. But you might approach a bow hunting company.