First of all, I will like you to know that the feerate paid this time around is usually high. But, either miners that are not mining now will later start to continue to mine, or the mining difficulty will be adjusted which is not even up to 2 weeks from now.
Which short term solutions are developers working on to tackle high fees (besides the Lightning Network)?
Did you actually know that bitcoin feerate has been reduced to almost or slightly more than 50% if compared to the past.
1. The first reduction was when uncompressed legacy address was changed to uncompressed through data reduction. But some people can still even be using uncompressed paper wallet, and high fee is required during sweeping or transaction.
2. Fee was reduced when nested segwit was implemented.
3. More fee was reduced when segwit was implemented.
4. Even the upcoming taproot will significantly reduce multisig fee.
If those can happened in the past, there will be more solutions coming to reduce the on-chain fee. But some developers are making it worse, that is why you will see many wallet not supporting segwit.