If you have a grinder, why not just order separate beans for yourself? Or even supermarket beans? Beans are always higher quality and don’t deteriorate as quickly as ground coffee.
If you must use pre-ground, do either of the immersion brew methods. And all you can do then is tune your brew temperature, experiment with coffee to water ratio and brew times to taste, you can google generic advice on how to do so.
If you want to do pour-over, you just have to find a brand that comes in the magic grind size for your filters and do the same as above.