If you are posting crypto related posts because you enjoy doing them that is great. Each person needs to do what they enjoy or even making posts with nice rewards becomes a chore.
Doing things like the PIFC contest is really smart. As you stated "I'm aware that there's almost no public in my concert hall" and this is important. You need an audience to get that engagement about the things you write. The engagement then spurs other post ideas and added rewards...lets face it having rewards helps keep everyone motivated.
Anything you can do to increase your interaction with others on Steem will help you long term. Hope we see you making entries for the coming weeks. More others see you making entries the more likely you are to get added support on your posts.
Thank you! I'll try to find good content for the coming PIF contests. As for the crypto topics, I'm sure the popularity will increase once the market starts growing again. It's just another "Great Depression" these days...