Impound all Belorussian foreign assets, deny admittance to any EU country by a Belorussian citizen, etc. Belarus doesn't really have anything the West needs. Putin can prop up the dictatorship if he wants.
It's a pity that Joe Biden has no great relationships with all the people that matter, like the dictators of Belarus, NK, Califate of Ornia, Saddeiest Cleptocrats of Arabia, (Thuringia, Canadia and Turkey).