Cut the cooked bacon into tiny pieces. If you want to get crispy bacon without the mess, I highly recommend trying them in the air fryer (here is a recipe on how to make it).
Now chop the lettuce, tomatoes, and red onion. Then place them in A large bowl along with the chopped bacon. 
Cook and cool the pasta
Cook the rotini according to the instructions on the box and rinse with cold water after its done cooking. Drain it in a colander and add it to the salad.
Make the dressing by combining the ranch and mayonnaise together with a whisk.
Make the dressing
Pour the dressing over the salad ingredients and give them a good throw toss. Served immediately for optimal crispiness and crunchiness.