krouchr The function to redeem SimPoints hasn't worked for months, and there's no indication it's coming back. And to my knowledge, there has never been a way to convince EA support to add the points manually when they didn't appear on their own. So there is unfortunately no way to get free points.
If you want to buy some, you can do so through the EA App. Click Sims 3 > Add-ons, and Sims 3 Currency should be the first option. I realize that's not what you want to hear, but it's the only current option for acquiring these worlds, unfortunately.
If you do end up buying points, please be aware that Sunlit Tides standard goes on sale once every 82 days or so, for 1127 points rather than 2450. Serenity Retreat, the venue that comes with the gold edition, is on sale several times during the Daily Deal rotation, the cheapest price being 513 points rather than 1539. So if you're patient, you can get a lot more for your points. Please see this thread for more information, and feel free to ask for Daily Deal help in general there too:
Daily Deal (DD) 2018 Rotation List and Sales Help | EA Forums - 1821670