Have you tried or thought about bringing some snow in for your little to play with? Maybe hide something colorful inside of the snow to find :)
Following
My little one is 6 months and loves playing with a foil blanket. Definitely a win!
Following
following
Following
Maybe something like this for tummy time might help. TT TUMMYTIMEZ Premium Tummy Time... https://www.amazon.com/dp/B08P9VRY18?ref=ppx_pop_mob_ap_share At that age, I incorporated some FaceTime time with family; played with age-appropriate developmental toys (through Lovevery); watched 30-45 minutes of educational content; walk-through talk guided tour of the house—all of this was daily scheduled.