A strong vaginal smell is usually due to bacterial vaginosis (BV), which is due to a change in vaginal bacteria from the good ones to others that aren't so good. It's not an infection, but it's usually treated with specific antibiotics. The antibiotics can be used as suppositories or pessaries, but if that is not successful, then giving the antibiotics by mouth is usually successful.
I don't think there is much you can do about excess sweating down there, but sweating in itself doesn't usually lead to BV problems. Stress can, so dealing with stress (exercise, good nutrition, enough sleep, perhaps yoga) can be helpful.
Douching seems to increase the chance of BV, so I would recommend against it.
BV can be troublesome. It can usually be successfully treated, but has a tendency to come back. I would work with your doctor, try oral antibiotics, and sometimes using lactobacillus vaginal suppositories can also be helpful. Best wishes.
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