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You can ignore the results which show up in the Trials sub-database when looking for systematic reviews: They are records of controlled trials and may make the result set appear a lot bigger than it really is, if you’re focusing on reviews.
The Cochrane Library (including systematic reviews of interventions, diagnostic studies, prognostic studies, and more) is an excellent place to start.
Even if you do find another review or synthesis on your topic, it may be sufficiently out of date or you may find other defendable reasons to perform it again.
In addition, looking at other research syntheses published around your topic may also help you refocus your question or redirect your research toward other gaps in the literature.
You may also want to consider registering your own systematic review in PROSPERO.
You can use intitle:review OR intitle:”meta analysis” OR intitle:synthesis etc.