Good work! Thin to medium flexible pick for strumming. Less attack, won't 'dig in' when it shouldn't, requires less accuracy so gives the perception of greater control, and undeniably gives a better overall timbre or tone for chord strumming. Medium or higher thicknesses when needing a compromise for individual note picking.

I second the suggestion to find a song (i) you like, (ii) within your skill level, (iii) taught by Caren Armstrong. Why?

Learning a strum pattern within the context of its overall melody, rhythm and tempo of a song is IME, easier. It lends context which assists instinctive learning complimentary to the dry repetitive focused drill exercise.

Caren Armstrong gives exceptionally relatable but in depth explanations of technique, tone with attention to every nuance in her song lessons. In the particular she explains the detail, especially strum pattern, broken down into its basic form in plain language and in a manner which is easy to comprehend in toto. It's a particular characteristic I've noted of her lessons I've done so far, and strength of hers, which personally, I really enjoy. e.g "Don't Cross The River", "Wonderful World" (Sam Cooke ver), "You Send Me".

Otherwise glad to hear you feel you're now making progress. 👍