Many factors weigh on the valuation of a company, and for sure there are no two businesses alike. Furthermore, even similar companies find themselves at different stages of their lives when they start talking with investors and buyers: some are consolidating while others are expanding; some are profitable right away and others are not for a long time; some are not even generating revenues when they are acquired.
But a very effective way to monitor the market (albeit quite simplistic) is to benchmark the M&A activity in a specific sector and in a given period. Markets go through different phases after all and there might be more or less appetite for companies like yours, and therefore investors might be inclined to accept higher or lower valuations.