Threaded Brass adapter leak
My personal preference (currently, it used to favor tape more) is to use PTFE pipe dope (paste) rather than tape for threaded joint sealing. I generally have fewer problems that way.
It's also become needful to closely examine threaded fittings as many in the current era are poorly made and may be difficult or impossible to seal due to thread defects that should never have made it out of the factory.
These two things may not be unrelated. It's quite possible that better-quality thread machining meant that tape really did work better in the past. Or it may just be that when tape first came out, there was no PTFE dope, there was just dope, from the dark ages.
After that, crank it up more, but it's quite possible to ruin things by overtightening, too.