The trick to setting up effective alerts on SAM.gov is to use a combination of keywords, NAICS codes, and filters for set-asides, while understanding how agencies post opportunities.
First, set up a saved search with your primary NAICS code, 561720, for janitorial services. Next, use keywords that describe your services, such as "cleaning services," "janitorial," or "custodial." You can also add negative keywords to exclude irrelevant results. For set-asides, include filters for "small business set-aside" and specific small business programs you qualify for, like "8(a) Business Development Program" or "Service-Disabled Veteran-Owned Small Business (SDVOSB)" if applicable. Be aware that some agencies may post opportunities using a different, but related, NAICS code, so consider broadening your search to include those if you are still missing relevant bids.
Agencies are required to synopsize proposed contract actions expected to exceed $25,000 on SAM.gov, so you should capture most relevant opportunities there (FAR 5.101(a)(1)). However, for opportunities below the simplified acquisition threshold, particularly those under the micro-purchase threshold, agencies have more flexibility in how they procure services. These smaller opportunities might not always be formally synopsized on SAM.gov, so direct outreach to agencies and networking remain important. Regularly review your saved searches and adjust your filters or keywords based on the results you receive to refine your alerts over time.