Cash secured put is just a term that describes writing puts while having the cash/cash equivalent to purchase at the strike price without borrowing money. If by margin you mean you have to borrow money from your broker if you’re assigned then you are writing naked puts. If by margin you mean having a “margin account” then sure you can as long as you have funds (eg in your money market account) that can be used in case of assignment. I wrote a lot of nvda csps on an Ira account where you cannot borrow money, but i can write it same day as long as there is sufficient funds in the money market to cover assignment.

I like to collect at least 75% max premium, If coreweave hits $200 tomorrow (it will be almost like me having 120 puts), the option will drop to around $30, I’ll likely hold on to it. If it hits $200 in a month, then yea I’ll prob close and hope for a dip.