Gas giants generally only get slightly larger than Jupiter (even with adding a lot of mass), until they start to shrink - and eventually with enough mass, turn

Gas giants generally only get slightly larger than Jupiter (even with adding a lot of mass), until they start to shrink - and eventually with enough mass, turn into actual stars [https://en.m.wikipedia.org/wiki/Gas_giant https://en.m.wikipedia.org/wiki/Gas_giant] So generally, gas giants don’t get much bigger than Jupiter.