250K in economy? OUCH.

As Kiwi Flyer advised, it's time to optimize your miles, GoodYear. Examine which airline you fly on the most, and where your longest segments are. If you find that the majority of your flown miles is on SQ, then KrisFlyer would be a good candidate for your main FFP, as the tier bonus will help add to your accumulated miles. Use KF miles to upgrade your longest SQ segments (the transpac segments, I assume): as a KrisFlyer, you get preferential access to SQ awards, and earning the miles on the underlying Y ticket allows you to reduce the runoff on your miles.

If it's on another airline that you fly most or fly the longest segments, consider becoming a member of that airline's FFP. Again, the objective would be to use your miles to make your travels a bit less arduous than they already are.