Frank,
My total flying hours are not that much higher than yours -- I don't think I've passed the 200 hour mark yet. I take a similar approach, with a few modifications. I do try to fly in less than ideal conditions, just to get used to it and build my confidence for those days when you take off in nice weather and things deteriorate. I've had a couple of "Well, I won't willingly do that again" experiences.
I also try to get out on flyouts as often as I can. From those I learn a lot about getting to unfamiliar airports, spotting the runway (often a challenge!!), flying the approach, etc. It's good to have others ahead of you so you can hear & see what they do.
This summer I have a few cross-country trips planned just to expand my experience. No schedule, other than "land somewhere before dark". And don't forget tagging along with others also. I hitched a ride to Oshkosh a coupe of years ago, which made it a lot easier to have the confidence to go myself - solo - last year. I don't think I would have done it without having ridden along while someone else (who had not been there before either!!).
Dale