The key to the perfect Instagram feed isn't the app you use, or the price you pay for the preset - it comes down to quality and consistency ! ! !
Is it a warm tone color scheme, a cool tone color scheme, or maybe it's a black and white feed?
VSCO is a great place to start, it works great for free filters, and there are a ton available for purchase as well!
So, start applying a filter to one single photo that represents your entire brand, and if it fits - apply this to EVERY SINGLE other photo that you upload.