What is the best program or way to solve undefined protein subcellular localizations?

Hi, I’m analyzing the subcellular localization of the proteins of a constructed pangenoma, using Cello 2.5 and PSORTB.I wanted to ask for some advice to further refine the output of each program and reach a consensus since I’m analyzing a pangenome with 4800 proteins with PSORTB and I get 1900 proteins whose subcellular localization is undefined.
Is there any other program to analyze this? Any advice?