I live in a lefty state, NJ. It's actually more purple than you've been led to believe. My friend started a GOP Executive Committee in the town over. The town went from Dems running unopposed to almost half the town government being Republican. I asked him how I could do it my town in his Facebook group. I was immediately contacted by the county GOP. I created a town GOP page and have over 60 members in a week. Our first meeting is next week.
Take action! We can take over at the local level. Then we worry about state and national seats. Let's build a solid base they can't knock us off of. Good luck pedes!
If your county GOP is entrenched RINOs, taking over is possible but might take a few election cycles. An alternate, while in the longer cycle, is to start a GOP County Woman's club. It doesn't take any elections. It can be federated or not. My wife started one in our county and it quickly became more politically important than the county GOP. The woman's club arranged and sponsored the Lincoln/Reagan diners (where candidates give their public election speeches). It didn't take long until she was on first name basis with our state reps, our federal congressman, and our LT governor.