Are there any holes??

Hii!! I started my exercise journey about a month ago and have further plans of exercises to add on (don't want to learn too much at once and overwhelm myself...) and was wondering if I had any holes in my plans or if there was anything I should consider adding. For context I'm f 21 and 150 lbs, I've lost about 80 pounds so far, but I am still very weak physically and would like to get stronger for health reasons (+ to potentially firm up some loose skin I may have from continuing to lose weight).

My current workout schedule consists of planks and pushups 3 days a week and then cardio/running 4 days a week. I plan to add on squats in my next session and I was wondering how far I could get with just those three strength training exercises 3x a week. I was also considering adding on pull-ups sometime soon, and then maybe trying out some weights to see if I like it?? I don't know I'm very new to all of this and have just been trying out new things to see what I like.

Any advice is much appreciated!