Two things to think about:

(1)  The real challenge/reward is not getting a sub to do something they hate because you demand it of them, it's pushing them to do something they secretly desire, yet are ashamed of, and you discover it and push them into it- that's the power of exploration, mindfuck, and that's the purpose for the trust, chemistry, etc. that goes into domination.  it's about being relentless, but not about being a bully

(2)  Limits are important, but they have to be honest.  They should be something you simply are not comfortable exploring in any circumstance, not something you just happen not to be into.  For example, "tickling" is almost never a valid limit, yet I see it listed on profiles as such.

There's a difference between being a bottom and being a sub.  Both can be fun, but before you confine yourself to being a bottom, at least try to experience what real submission is about........