Doing HyperParamaeter tuning second time

I am making a random forest model and doing hyper parameter tuning, I did it first time and I noticed that best params include max_depth as 19 which is the max I given in range (2,20), so I want to see if I can increase my performance increasing max_depth. my question is that can I fix other parameter such criterion, max_features etc. as showed by my best_params and just vary the max_depth. Can I do that and if not why ? here is the screenshot of my code