It's a tough one. Im quite lenient, there's a range of outcomes and I'm conservative with growth. If I think a company can maintain 12-15% EPS growth then I'm happy to pay 20x last few years average earnings if it's 10% it's more like 15 times. Eg when Alphabet fell to 17-18 it's attractive, Meta at 20 and below then that was attractive, it's about consistency of those earnings and growth eg how sustainable is the business model and what's the moat. Sometimes it goes wrong like with BABA and the earnings halve. It'll take longer..... As long as you get more right than wrong you should be OK.

That's all I do and filter the companies that meet that model from the super investor picks. It leaves a very shortlist of companies perhaps 10-15 that I like max and only a handful at a valuation that's attractive at the time.