You are certainly off to a good start. With the Tanzer you are a little more physically connected to
wind,
water and boat, than you will be with your new 38'er. Everything will cost a lot more. You probably have an inboard
engine that you will praise when it works and you need it, and curse when it doesn't
work and you need it, and regret when you have to spend a lot of
money on it. Yes, in general, the
money pit is broader and deeper with a bigger boat. But your accomodations will be much more comfortable and you will sleep better. You will be able to sail in more blustery conditions without taking such a bad soaking. Your
draft might keep you out of places that your
small boat could explore.
The bigger boat needs a little more time and distance for maneuvering, so in tight places, plan your turns and your sail and trim changes plenty far ahead. With more mass, you might be more likely to crunch into immovable features than bounce off them. Recovering a crew
overboard, or getting your own self back onboard, will be a lot harder with the big boat. Get serious about running jack lines and staying clipped in, especially when sailing solo. You will probably do more
anchoring. Check your
anchor rode carefully for rust and chafe, and whatever
anchor you got, consider upgrading. Especially if you have a
windlass.
Learn to reef. Learn to reef before the
weather blows up, and also learn to reef after the
weather has blown up. Learn to heave to. A very useful skill in a boat over 30'.
There are a jillion traps and pitfalls to going to a larger boat and you are sort of skipping an intermediate stage, going from a 22' to a 38' boat. But overall you will enjoy it more, probably, especially if you are not sailing alone.
Be careful jibing, keep it under control. With an itty bitty boat, worse case you get wet. Well, or conked in the
head with the boom. On a bigger boat, sometimes things break. Important things.
It would be good to have some friends along for the first few times you take the bigger boat out, who have plenty of experience in midsize or larger sailboats.