You can replace districts past your cap. : r/Stellaris
Jan 18, 2019 Stellaris 2.2.3 patch released, and 2.2.4 beta now available Stellaris - demasiri_pdx Note Checksums are as follows: 2.2.3 = 746c 2.2.4 = f25b --- Hi all. After a good chunk of time in public beta, we are rolling out 2.2.3 as the official live version ...