Soft tissue sarcomas are highly malignant, rapid growing. My Father died from fibrosarcoma.
There are approved therapies for fibrosarcoma in cats. In other countries fibrosarcoma is being treated with similar therapies in humans.
Fibrosarcoma tumors can change in size. The center of the tumor is filled with dead cells and cancer cells do not live very long. As the center cells sluff away and then regenerate, a tumor can fluctuate. Also, alternative therapies can cause shrinkage and sounds like you are close to getting the right therapies.
Alternative medicine being done without licensed practitioner is usually insufficient. Dosing, adjuncts, and testing are never up to par in home-treated individuals.
Some people have gotten lucky and picked the right therapies and the right dosing.
I do not recommend you doing alternative therapies by yourself. If you need guidelines there are better explanation of what cancer is and why therapies work you can go to research site, AmericanCancerAdvocates.com
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Remember this! Cancers burn glucose by fermentation and hate oxygen.