Bleeding clutch slave cylinder

So around the time I bought my car about a year ago, my clutch would stick sometimes and I’d have to pull it back up with my foot when I shifted, then one day I went out and it just stuck to the floor. No big deal, bled the clutch slave cylinder and the clutch felt great again. Fast forward to almost a year later and thousands of miles, clutch is sticking about half way through again, no biggie time to bleed again. Only this time, I opened the bleed valve and some fluid dripped out, then ceased. Now the clutch pedal forces itself back down to the floor when pulled up every time, although every time it’s depressed I can hear air being relieved through the slave cylinder bleeder screw, but no fluid yet after hundreds of times pumping the clutch and opening and closing this damn screw. Nothing even happening in the clutch fluid reservoir, whole time full. I went out and rented a brake vacuum bleeder kit although I’m not sure how to use it to bleed my clutch I’m sure it can speed up this process. Would an excessive amount of air in the system cause the pedal to force itself to the floor without being touched?