Adding to the other comments, you’re on a 200GB per month plan. Eight also offers a 388GB per 30 days plan for $8. If you’re age 60+ the similar senior plan is $5. One would think nearly double the data allotment would already be a lot. If you find you need more than 388GB you can pay more at that point in time.
Also, SIMBA offers $10 and (for seniors age 60+) $5 plans if you prefer SIMBA’s network.
If you want a match for your 200GB plan, but on Singtel’s 4G network (and you’re not a senior), then Zero1 can help with their $7.06/month Starter Prime plan. It also includes 200GB per month. However, if you qualify for VIVIFI’s current 9 months free port-in promotion on their Roam Asia Super plan then I think that’s a much better deal (for the next 12 months total; after that you‘d check for other deals again). VIVIFI charges as little as $45 for the 12 month period (equivalent to $3.75 per month) if you qualify for their promo, and that’s a 400GB/month plan (with 4G and 5G on Singtel’s network).