#1 IMPACT Wrestling star with contract expiring in first quarter of 2021: Willie Mack - expires in April 2021

Willie Mack has been a member of IMPACT since 2018. He's been an ally of current IMPACT World Champion Rich Swann, and the two have been active as a tag team. They were also both singles stars independent of each other, as each man won the X Division title.
While he's not the strongest performer on the mic, Mack does his best work in between the ropes. When you look at him, you don't think he'd be able to hit a standing moonsault. But he can. Wrestling works best with stars of all shapes and sizes, and sometimes those of a different size can shock us with their athleticism.
Mack has been a consistent face in the mid-card and occasionally in the main event. With Swann holding the top prize in IMPACT, it would stand to reason that the two will eventually face off for the title. Whether or not one turns heel remains to be seen. It would be a good change for either of them, as they've both traditionally been babyfaces throughout their time with the company.
Mack's deal expires in April 2021, so there still time for the two sides to negotiate a new contract. Mack would be a good addition to any promotion, but his best two options might be staying with IMPACT Wrestling or going to All Elite Wrestling.