No, it's the only clear-eyed solution because it recognizes reality for what it is instead of what we wish it was. Conservatives do not care about violating norms of judicial confirmations to get their way. Liberals do. This has led to an asymmetric situation where despite Democrats winning the presidency 5 out of the last 8 times in the last 30 years (and really, the popular vote 7 out of 8) we have a situation where there is a conservative supermajority on the court.
So what I propose is that liberals wake up and realize that since conservatives don't care about judicial norms anymore, they shouldn't either. When you don't have norms to constrain behavior what do you use instead? The power you have. Add justices to balance back out the norm violations of the Republicans and then offer them a deal to reform the court once and for all to stop this stupidity. If they refuse to deal, add more justices. Rinse, repeat.
Sincerely though, if you have a way to make Republicans respect judicial norms again without expanding the court I'm open to hearing it. I just have no idea what that would be because I'm very confident they look at their actions over the last 5-6 years and see them as an unmitigated success.