I'm just gonna warn you, if you read Martial World, you wouldn't be able to stop halfway unless you finish that arc. It's like Dragon Ball Z, there's an intense atmosphere that would leave you at cliffhangers if you didn't continue reading.
You're so lucky...your list is so short....mine has like 90 items...its gonna take a year to read them all....perhaps longer due to how busy I'm going to be.
Hokuou Kizoku to Moukinzuma no Yukiguni Karigurashi for a classic slice of life Read Dragon Blood Warrior if you are horny
Legend of Sun Knight! And agree with comments above, definitely a good idea to read completed ones first as a general practice since that naturally lets the ongoing ones stack up more before you get to them.