Throughout his later life, Radziwiłł struggled with the constant financial difficulties and lived with the fear of not repaying his enormous debt.
An investigation began in Nowogródek on August 12, 1777, which slowly continued for many years and had no result on the situation.
Radziwiłł made ineffective attempts to recover all the estates in the Russian partition of Poland; he was refused to travel to St. Petersburg and was denied permission to visit Catherine II during her travels to Belarus in 1780.
Potemkin also denied to help Radziwiłł.
Furthermore, he was offered some of those estates by the government of the Russian Empire.
Radziwiłł's attempts to receive loans abroad, in the Netherlands, in Genoa and in Germany, were purposeless.
Some of his closest friends and supporters promised to develop a loan of 100,000 ducats, however, this also failed.

Between 1780 and 1784 Radziwiłł was forced to sell some of his estates in Volhynia (Wołyń) and later the entire city of Żółkiew.
Karol Stanisław progressed slowly in rebuilding the Nieśwież residence that was devastated by the Russian forces.
He was responsible for resurrecting the local theater and establishing the new repertoire, mainly based on ballet led by renowned ballet masters like G. Pettinati and F. Casella.
In 1783 he employed a team of Polish professional actors led by L. Pierożyński.
Radziwiłł also hired an orchestra from abroad to play during balls and organized several gatherings, which were attended by the greatest writers, artists and mathematicians of his era.
Although he suffered great losses, following his return to Poland, Radziwiłł once more became one of the most influential diplomats in the country.
In 1790 he instructed to sell his possessions in the Vilnius region to nobleman and composer Michał Kleofas Ogiński.
Throughout his later life, Radziwiłł struggled with the constant financial difficulties and lived with the fear of not repaying his enormous debt. An investigation began in Nowogródek on August 12, 1777, which slowly continued for many years and had no result on the situation. Radziwiłł made ineffective attempts to recover all the estates in the Russian partition of Poland; he was refused to travel to St. Petersburg and was denied permission to visit Catherine II during her travels to Belarus in 1780. Potemkin also denied to help Radziwiłł. Furthermore, he was offered some of those estates by the government of the Russian Empire. Radziwiłł's attempts to receive loans abroad, in the Netherlands, in Genoa and in Germany, were purposeless. Some of his closest friends and supporters promised to develop a loan of 100,000 ducats, however, this also failed.
Between 1780 and 1784 Radziwiłł was forced to sell some of his estates in Volhynia (Wołyń) and later the entire city of Żółkiew. Karol Stanisław progressed slowly in rebuilding the Nieśwież residence that was devastated by the Russian forces. He was responsible for resurrecting the local theater and establishing the new repertoire, mainly based on ballet led by renowned ballet masters like G. Pettinati and F. Casella. In 1783 he employed a team of Polish professional actors led by L. Pierożyński. Radziwiłł also hired an orchestra from abroad to play during balls and organized several gatherings, which were attended by the greatest writers, artists and mathematicians of his era. Although he suffered great losses, following his return to Poland, Radziwiłł once more became one of the most influential diplomats in the country. In 1790 he instructed to sell his possessions in the Vilnius region to nobleman and composer Michał Kleofas Ogiński.
Karol Stanisław Radziwiłł (1734–1790)