Credit One has severely restricted its approval due to the Corvit-19 Pandemic. We suggest the following cards instead.
Upgrade Credit Card
Apply Here 
If you have mid 600 scores and above, no lates for 2 years and a decent W2, then this is a good card to consider since it also provides a personal line of credit.
Southwest Airlines Rapid Rewards® Plus Visa
Apply Here
This is one of the easier airline cards to get if you fly Southwest. You need to have no lates for at least 2 years, decent utilization to have a chance to get approved. Apply if you have mid to high 600 and give it a shot.
Indigo® Platinum Mastercard® Credit Card
Apply Here
This is one of the most comparable alternative to Credit One