Is there any way to increase the number of USB Hubs in my computer?

Yes, you can increase the ports on you computer system but it need some serious carefulness or otherwise you could fry the motherboard al together. If you take a look next to the built in Audio ports(depending on your motherboard) there are some kinda like slot(with pins) written usb, thats where you will plugin your usb cable with pins Sometimes the usb cable with those extra ports could be difficult to plug on the motherboard as you might not know which pin cable goes where and to insert them in a wrong could cause damage to the motherboard, but yes there is a way of adding another usb ports on your system

You need wired usb hub. You can buy that at your local computer hubs.

You might want to get 4 port or more USB hub.

You can increase the number of ports with something called a USB hub. It commonly comes with 4 extra ports, which you plug into an existing USB port. I recommend that you get a powered USB hub, one that comes with a power cord and plugs into the wall, otherwise your devices could draw too much power from your PC.