There is a hard fork wishlist:

https://en.bitcoin.it/wiki/Hardfork_Wishlist

Note last update is somewhat old.

Cheers.

On Sat, Oct 16, 2021 at 12:49 AM James Lu via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> Making Bitcoin function after 2038 is by definition a hard fork
>
> I feel if we do HF, we should bundle other HF changes with it...
>
> On Wed, Oct 13, 2021 at 5:19 PM vjudeu via bitcoin-dev <
> bitcoin-dev@lists.linuxfoundation.org> wrote:
>
>> It seems that Bitcoin Core will stop working in 2038 because of assertion
>> checking if the current time is non-negative. Also, the whole chain will
>> halt after reaching median time 0xffffffff in 2106. More information:
>> https://bitcointalk.org/index.php?topic=5365359.0
>>
>> I wonder if that kind of issues are possible to fix in a soft-fork way.
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