You can use the beginning capital account as listed on section L on the k-1 schedule as your beginning basis at January 1, 2024, unless there are any items you know of that affect your basis that are not included in the amount. For instance, if you personally guaranteed partnership loans that would increase your basis but wouldn't be reflected in your capital account.
Increases in 2024 would be things like your share of partnership income and monies you contributed to the partnership. Decreases would be things like your share of partnership losses and money you withdrew from the partnership. For the most part, you could work off the capital account entries as listed in section L on the K-2 schedule, unless there were things that affected your basis that would not be reflected there.
You don't need to amend the 2023 return unless your tax would change because you assumed a wrong basis. For instance, if you deducted more in losses than was your basis, you would need to amend the return to correct that.
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