What should my next campaign be?

Just wrapped up my first campaign, uniting Ireland as Mumu starting in 936. I dealt with heretical rebellions, succession crises, and converted to feudalism, but left Ulster alone since Scotland snatched it up. I skipped launching a crusade since Islam was struggling against Leon and the Byzantines. What’s a good realm to play next? I know the basics of CK2 without DLC. Any realm suggestions with objectives? Thanks!