Without the intervention of digital marketing services, dwelling on the SERPs and retaining the ranks is a day dream. Then, you have to find and hire seo company in singapore or elsewhere to whom you can easily outsource the whole liability of digital marketing on your behalf.
Make sure, you have been referred by someone about the company. You can also search on your own and check the ratings of the service providers before signing up. Visit their own websites and check the ranking to estimate their passion for the job before allowing them to audit your website for a estimation.