Hashtag research in 2019?

Hi there,

First of all, I want you to know that I already used the search button and spent quite some time reading the topics about hashtag research.

However, I’m still confused about it. I don’t know if there is a solid method to follow when selecting hashtags. Some mentioned tools like https://displaypurposes.com but I’m not sure if this is the best way to go.

I guess the best way is still doing the research manually on Instagram while analizyng top performing posts but perhaps you know a more systematized way to do it.

I want to offer this service to my clients and if you could guide me on a way to easily replicate and escalate this thing in a proper way, that would be really awesome.

Thanks so much!