PA28 is a perfectly serviceable, decent trainer (and tourer), however, it is not really that exciting, and the OP claims to be bored of flying.
IMHO change keeps things interesting. Do different things and you won't get bored.. Different types, tailwheel, different places, etc. Different places gets difficult as it usually means going ever further afield, and gets ever more expensive.
For me, a challenge - gliding (staying up!), aerobatics... If all I did was fly a warrior around the local patch I'd have given up very quickly. And I do sympathise - coming from aus the pain of conversion, and the additional (onerous) requirements make me wonder if it's worth it.. If I stopped, I'd probably not start again, but then every time I get airborne...