There is an often repeated saying "Insanity is doing the same thing over and over again and expecting different results."  It appears the best evidence is that this was first said by Rita Mae Brown.

You might want to check yourselves to make sure that you are open to doing new things in order to get different results. 

This is similar to the often quotes saying that Thomas Edison failed 1,000, or 5,000, or 10,000 times before finding a combination for the light bulb that worked.  He is reported to have said something like "I have not failed 1,000 times, instead I have found 1,000 ways that will not make a light bulb."

So persistence does not have to mean that you keep hitting your head against the wall.  You might want to evaluate how what you are doing is helping you achieve your goals.  Do you have the belief, feeling or evidence to show that what you are doing is getting you closer to your goal?  If you do than, keep going and be persistent.  If not, then make some adjustment, small or big.

When you are trying to form a new habit and develop your mind it takes time.  Unlike trying a new design for a light bulb, developing your mind requires patience   Would you go to the gym one time, then jump on the scale and if you didn't see results, stop going to the gym, or radically change your workout?  You have to allow time for your actions to influence your mind.  At a minimum, I would expect 1 month to be enough time to see results if you are taking regular actions 3-5 days per week.

My advice then is to choose your goal, take some action, and then keep taking action at least 3-5 days per week and do that for 4 weeks.  After 4 weeks if you do not have any evidence, feeling or belief that your actions are producing results, then change your actions and try again.