concentrate on what you know. just seen 2 window cleaners walking past our house and doing a few on the way, 2 inches of snow dint stop them. sounds like your not happy doing what your doing, what you need is a good kick up the backside, youve got half a business or whatever, all you need now is the push to get more work. get out there and graft. our local cleaners are a massive set up so theres money to be made. moving into carpet cleaning half assed is the same as what your doing now, what you gain from carpet cleaning you'll lose on window cleaning and you'll be no better off. get off your backside and go get rich.
the time to diversify is when youve conquered what your all ready doing.