There is not much you can do for the list of people following you, however you can determine if those you follow are active on hive if you use peakd and look at your following list it will let you know when their last post was.

Unless you have a lot of dedicated followers, the tags you used - CLUSTERHAT DOCKER PORTAINER RASPERRYPI -don't really lend to people finding your content. There is very little activity in those tags.

Communities are a great place to get started with finding a group of like minded people interested in what you are posting about. In the case of you post mentioned above the STEMGeeks Community Might be a good place to start.

There are always going to be pluses and minuses to all the varied sites, success on Hive comes through being able to find your audience, posting into obscure tags is not really going to do that for you.