So I have doin telekinesis before and I'm thinking about it again if I do it again will I be weaker or will I just start where I left off and also there are things on YouTube about hypothesising your self to become stronger it's that true a bunch of crap

I guessing it'll be weaker b/c u probably haven't practiced in a while. It usually happens w/ anything: For example, I'm technically a pro swimmer-- not a competitive one. But after 'bout 3 years of being lazy, I lost my technique. So a few weeks ago, I joined Saf-T-Swim & after 4 weeks (2 days per week) & I got it back. I now joined its team. Or anything else, It's the same thing.

your energy is like a muscle it loses its tone after awhile of not exercising it, in a sense chi and psi energy work the same as your chi energy gets stronger with each practice session