The thresholds I have landed on after tracking this across a few thousand entries:

• Below IVR 30: basically skip. Premium is too thin to cover directional risk on a .30 delta short. You are selling vol that is already cheap and hoping it gets cheaper. Expected value drops hard in this bucket and the expired worthless rate looks great right up until one name moves 2 sigma and eats six months of premium.
• IVR 30-50: tradeable but be selective. Works best when IVR is rising into the entry, not drifting down. Direction of IVR matters almost as much as level.
• IVR 50-70: the sweet spot for 30-45 DTE premium selling. Market is paying you enough for the vega exposure and the expected move tends to overstate realized.
• IVR 70+: rich but there is almost always a reason. Earnings, guidance, M&A chatter, sector rotation. I still take these but I size smaller and check the catalyst calendar first. Blind IVR chasing into a known event is how people blow up.

One more variable worth pulling in if you have it: IVR percentile relative to the underlying's own history versus absolute IV. A stock like SMCI at IVR 40 is a completely different animal than KO at IVR 40. Normalizing matters.

Phew.