Remake Destiny 1 with the same content and features, but update the engine first, then add the new stuff from Destiny 2. No portal system.
But Destiny 1 wouldn't end like the old destiny 1 it would continue into destiny 2 until the end of Final Shape.
Update the features for a couple of years and release content, while you make the next destiny experience like a destiny 3.
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Idk why everyone asking for a Remake or D3 both are impossible because all they time and investment the going into marathon not to mention quantity of staff and funds that only seems being funded by Destiny 2. Pretty much doubt Sony going to give them anymore money how bad they messed up with the funds they got with so many projects that got shut down. Sad to say they only option is to fix D2 by trying things around in renegades and hurry up to get Marathon out the door in a great condition so they can make some money back on their investment. They are in a dire situation now