Second this. Don't do it as regular as I usd to because I don't feel like the effect is as profound anymore.

That is not to say that I don't feel like meditation works, but more to say that there seems to be a big change after a longer regular period of meditation, but then further improvements seems to slow down. But I can way more easily get into a relaxed state and calm my mind than I could before doing any meditation. I just don't do it as regularly anymore as I find the further incremental improvements to my everyday life to be smaller.

You need to find the proper guidance/tools/technique to continue to make progress. That's why is best to find a competent teacher, otherwise you will hit a plateau and will think that's all there is to it.