Dry some leaves of this guy before it blooms https://en.wikipedia.org/wiki/Chamaenerion_angustifolium. You can squeeze them by hands before drying or not, the tea will be kinda "red" or "green" accordingly.
This thing is awesome too https://en.wikipedia.org/wiki/Hypericum, just dry the flowers or any part of the plant with blooming flowers attached.
If you are into fruity tastes, just dry loads of raspberry leaves or whatever berries you have and steep them with tiny amount of any tea.
We have a shop that sells some good teas made in Finland: teemaa.fi
We have https://professional.sunstargum.com/en-en/#cmp-accordion__item-europe too. There was really nice toothpaste from Urtekram, but it's gone from stores for a year now for some reason.