White Belt working on Open Guard retention

I’m a white belt that’s been training for almost a year now. After watching some competition footage of guys with killer open guards like Levi Jones and others, I bought Lachlan’s guard retention instructional and have been working on my guard retention for the past 5 months or so. I start most of my rolls on bottom and just try to keep my opponent from passing. My guard is getting much better and I’ve found some transition into K guard from here naturally. I still get smashed by blue and purple belts of course but I’m holding my own against my peers at white belt level. The problem is I’m unsure of where to go from here. Most of my rolls are very defensive based and reactive so because of this, I feel like my offense is lacking. Sometimes I get lucky with a triangle, armbar, or the rare invert to back take. I don’t know any leg locks, which might be one of the issues. Is open guard better for leg entries and not great for upper body attacks? Should I start to abandon the open guard until I learn more lower body submissions? Or should i start incorporating wrestle ups and such? Any advice for where to go from here would be appreciated.