Reconstruct signal after altering peaks on fft process

Hello everybody! I am new to signal processing techniques and so i want to ask a few things about signal reconstruction. Here is my code for what i have done so far

[audio,fs] = audioread("thunder.wav");
%keep the first side of the audio
audio = audio(:,1);
%fft perform 

count = 0;

x = fft(audio);

pks = findpeaks(abs(x));
  
findpeaks(abs(x));

for i = 1:length(pks)
    if pks(i,1) > 15.000 
        count = count + 1;
        pks(i,1) = 19.200;
    end
end    

So, as you can see i have altered all peaks that are above 15,000hz to 19,200hz. From, this point i want to reconstruct the output signal but i want to mantain the alterered peaks. To be panctually, i want somehow to reconstruct my signal from all the peaks included to pks matrix. Is that possible and if it's possible how can i achieve it? Thanks, for your time!