Question edited for clarity.
'7' is just the size in inches. They have a number of models and perhaps you have an old one? The first thing to try would be a Hard Reset, but they are a very basic tablet for just under $100. Having said that, with new models, they do have internal storage of 16Gb and 1Gb RAM Memory
There are some ideas here.
https://www.google.com/search?q=contixo+7+very+slow
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