You are starting out the hardest way possible With deficient equipment that will not give you the results clients are looking for, nor will you appear professional to them.
The easiest part for of this business is cleaning. The hardest part is getting the work. If you can't keep the few customers you service you'll never make it.
First impressions are everything!
I too started out with a portable but it was a professional portable not a Bissell. Even so, I had to work harder and longer then I do now with a well set up truck mount.
I also had clients that wanted a Truck Mounted machine. When they said that I told them I have a TM. I then operated my portable from my van.
I'd suggest you get rid of your Bissell, and if you either get a used truck mounted machine, or a good portable but you need to run a rotary with it like the Mytee T Rex. Here's a link to the one I'd suggest you get. I have 2. https://www.mytee.com/products/t-rex-jr-total-rotary-extractor/#.Vw7Ri5MrJEJ
If you go the portable route then I'd get either the Mytee 7303 LX Air Hog Vacuum Booster which I now sue on jobs I can't use my TM on. https://www.mytee.com/products/7303lx-vacuum-booster/
I'd pair the Mytee LX with a Mytee Water Hog. https://www.mytee.com/products/7304-water-hog/
You can clean carpet with it or even tile and grout as it goes up to 1,200 psi which you need for T&G.
The above is my portable setup I use presently.
who owns Cross American https://crossamericancorp.com
makes the Jaguar portable unit that has a lot good qualities. I don't own one but I've used my friends Jaguar, and it will get the job done too.
Whatever portable you get, you need a Mytee T Rex to go with it. JMO
But ultimately I'm a truck mount guy.
If you have any questions you can ask them here or PM me. I'm not an a seller of equipment, pre-sprays, classes, or guru of consultations and the fees that go along with it. I'm just another carpet cleaner who started out with an old pickup truck and a portable.
One question, what country, city, and/or state do you live and work in.