It depends on what caused the break in the first place. Many couples find couples therapy to be very helpful to keep their discussions on track and find the actual root of the problems.
My Man and I have been together for a very long time. We've had to rebuild several times. We relied on lots of talking, spending quiet time together and sex. This worked for us. We're a very physical couple and sex is part of the way we communicate and connect. The worst times we have gone through have been the times with the least sex. So, when we have to rebuild, we talk and have lots of sex.
It's always worked for us.
Good luck to you.