Whats the going rate for a construction pro/Handyman?

I am a construction pro I can do it all well wireing , Drains,supply line tiles drywall ect. I am basing my rate at 300.00 per day. I am thinking ti might be a Bit low. I try to give a firm price on a job based on this rate But in the end I am making more Like 200 per day. The jobs alwas take lomger etc... What is the rate . I am working very Hard and losing My shirt!!!!