OK, well now I know how much you weigh, that puts a slightly different spin on things. You need to avoid bikes made of Aluminum and Carbon Fiber, I know you are on a CF bike now but there isn't any CF bike that I know of designed for more than a 245 pound rider, so you are borderline over on the bike you now have. So that leaves only steel and titanium.
You also need strong wheels, low spoke count wheels that are the rage right now is a potential fail for you, you need touring type of wheels with 36 double butted spokes using brass nipples.
Bike wise Lynskey makes a bike for big riders called the R480:
https://lynskeyperformance.com/r480-road-race-bike/ If you by some chance want to go this route please let me know, I have some ideas for changes for the bike that will beef it up a bit better but most importantly increase the reliability of other stuff on the bike twice a long.
In a steel bike I would go with a touring bike all the way, they have strong frames and wheels designed for carrying a person and a load that could hoover around 260 pounds, so that is something to consider.
There isn't very many bikes on the market designed for larger guys, and larger guys that I see riding bikes are riding on bikes that are borderline and are subject to failing.
Well, been riding for 23 years. Mostly on aluminum. I have had some success with aluminum. Trek 1200 roadie 5 years not a problem. Sold it.
Cannondale CAD3 1998, still riding it not a problem. Bud who owns a bike shop said it was overbuilt and keep it as long as possible. Still riding it, still stiff and strong 20 years later. Did some major climbing with this bike. Timed event centuries with 12,000 ft and 10,000 ft gain several times and all the training that goes with it.
So I do have some faith in overbuilt big tube/ big BB aluminum frames. Still riding and enjoying it. Can't tell you how many miles are on it but the Trek/Lemond frames were 2005 and 2009. Both snapped after 13,000 miles. Wimpy frames. But this Cannondale is a 1998 and still riding great.
The Trek Madone is still doing much better than the Trek aluminum frames topping them by 2,000+ more than the alum before it broke. So I still have faith in carbon (not superlight frames).
Plus the max weight on Trek Madone frames is 275 pounds though some others are set at 240. Couple other carbon frames I searched are set at 265 and 270 ( I forget offhand which brands but I know the Trek limit)
As far as wheels. I had professionals build wheels that failed me. Mavic OP and several other box type rims. Low spoke count stock wheels suck too. I could never get over 2,000 miles out of a rear wheel.
Till my buddy built up a set of Velocity Deep V 30 mm rims. Year without a problem.
I had another shop build the same exact wheel and it was screwed up after the first 40 miles. Guy at the pro shop sucked to say the least. So I tried it myself totally stripping the same exact wheel. I rebuilt it and ended up getting 20,000+ miles out of it. Slight true at 14,000 miles. Only time I have had to touch them.
I have built about 10 wheels since then having 7 bikes and none have failed with thousands of miles on them.
So I learned much about good wheels is the build quality. I took some old wheels I had sitting in the closet after the shop that sold me a bike said I was too heavy for the 30 mm wheels having 28/24 spokes. They tried several times to adjust them and could not keep them true for more than 2 weeks.
So I stripped them totally apart and started all over after having success with my latest builds. I rebuilt them and guess what! They worked. I put 10,000 miles on these wheels with no problems. 28/24 spoke 30 mm wheels that the shop could not get to work.
I gave them to a bud who still rides them for the last 5 years no problems after I built up a new set for my new bike.
Best riding bike, too bad the frame broke. But the wheels were no problem after I built them correctly!
I do use 30 mm deep rims to build my wheels. Not into superlight ****. So after having 11 bikes, 2 tandems, I don't agree with the go for a touring bike or 36 spoke wheels. I've already proved the wheel issues to myself with several sets I HAVE BUILT with a little TLC.
As far as frames, I know I can ride road bikes, just have to find strong frames that do not flex too much under my weight Whether it be steel, carbon, or aluminum.