If ads are not displaying either Posts or Page or Homepage then understand why this happened, actually when you change a blogger template google, or any other ads partner that you use take some time to shows ads back again within 24hrs max. Try to use Incognito mode in your browser whether to see ads works properly or not. On the other hand, try to contact your ads partner or see the relevant solution on Youtube regarding the ads code placement, we already provide an ads space widgets section in our templates you can use that one place a Responsive ads code.