I think socialism is awesome but capitalism, when highly restrained, is more effective at generating capital.
I think a few fairly simple steps can merge the best of both.
Limit personal net worth to, say, 01 million dollars. Companies can have a networth of, say, 1 billion tops. Below that, put like 10 or so tax brackets, the more you're worth, the more you pay tax. Anything over those limits goes 100% to tax
This favors many smaller companies working together instead of one huge monster that can't even take care of itself and requires regular bailouts
The tax income will be more than enough to support a large socialist system that can take care of free education, free healthcare, etc, hell, even universal basic income
Best of capital generation,best of socialism.