Welcome to the forum! You've come to a good place, lots of helpful and experienced folks in here.
I agree with the others. Personally I would water it down, that's a great idea, and I would do it right away assuming your fermenter can handle the extra volume, or if not then later is fine too. High gravity can stress out the yeast so that's why I would do it sooner than later if possible, it would reduce the stress a little bit.
I would also skip the secondary step. When the beer is clear and "ready for secondary", consider just leaving it in the primary for another ~week. It won't hurt anything, and will allow the yeast to continue finishing fermentation for the last point or two if needed, and to clean up any sulfur or other off-flavors if there is anything present. A prolonged primary definitely does not hurt anything, it only helps.
Enjoy!