You have over 50 subscribers after 48 hours. What's the problem? Poles have their own instance yet the Warsaw community [email protected] only has some 250 subscribers after 5 years. Lemmy is just small and only a few of the 50k MAU (about 10 of which are Czech) will be interested, you have to promote the fediverse (especially in the Czech Republic) first.
I am happy about this fact and there's no problem at all. I just want this lemmy to grow fast and be a reliable comparator to r/prague - so not just locals, but friends and visitors have another source to find information.