For spider mites try a homemade spray using rosemary oil, peppermint oil, and garlic oil. Lots of recipes on the internet for homemade rosemary oil spray. It has shown promise killing two spotted mites. You can also try using a sacrificial plant, essentially treat all the plants except for one and then crowd the infected/treated plants around it so they are all touching for a few days, the surviving mites will theoretically migrate to the untreated plant. Then you throw it away, and treat your kept plants again. Apply the spray every 3-5 days for 2-3 weeks.
Alternately sulphur also works well to repel mites, either wettable or vaporized, just know you can never apply sulphur and oils within 3 weeks of each other or itll damn near kill the plant.
