Convert your track to 32 bit float before doing any processing. 32 bit can handle a huge dynamic range. It may appear clipped in the waveform display but the above-zero values are really there, which you can see by amplifying by a negative amount.
Apply the Clip Fix effect as suggested. Amplify by -6 dB to get most of the audio below zero. Then deal with the huge pops from mic handling noise. There are a number of ways to deal with that, but selecting them and then amplifying by an appropriate amount to get them down to the level of the rest of the audio would work, but might be time consuming.
You could try Steve’s Pop Mute Nyquist effect on the handling noise: https://forum.audacityteam.org/t/new-plug-in-effect-popmute/17499/1
– Bill