After the mainnet, it will be a working and promising project, therefore the dump after the airdrop won't be so dramatic as some thinks. Just HODL your PRL and enjoy your SHL as another functional coin besides PRL.
Successful launch mainnet will be turning point for this project while we will get another amazing token for free. I am pretty sure who will dump will be a big looser because we will be very close to this historic moment that is why your advice is looking nice.