This may not apply to a country specifically, but since you mention Instagram I'll share what I've noticed. If I look for hashtags with particular models of gear I turn up better quality pictures. At least, it seems to me they're better quality. Now, granted, a fair amount might be actual marketing photos and you can't use them, but the vast majority are personal pictures. And it is appropriate to re-share those photos on Instagram provided you give a credit back to the creator, and if they ask to take it down you comply. This isn't illegal.
To grow an account, use a hashtag cloud of relevant tags but you don't have to go overboard; maybe 8-10 tags is enough to turn up in the biggest searches. Don't be afraid to include some smaller-trafficked tags since the competition is lower and with a lower signal/noise ratio you're more likely to be noticed when people search for those tags. In your case, look for Netherlands-specific or Dutch language tags so you turn up closer to home.
To grow an account, find related pictures on other accounts, see who's liking those pictures and follow
those accounts. This will pop you up on their notifications, and if you have enough related or similar posts they will either follow you or at least scroll through and spend more time on your account. Obviously you want followers, but even if they just scroll through and spend time on your account, that's still an input signal in the Instagram algorithm and helps your account turn up more in the explore page or in recommended posts.
Hope at least some of this can help!
*I know you're asking for general advice on this, but I've done this as an income stream for a couple years now...if I'm out of line just tell me to shut up.
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