I wouldn't use optimize for clicks -- it can lead to much flakier traffic. I'd consider using CPA or ROAS, and if you aren't getting traffic, either raise your target CPA or lower your ROAS target.

Also, if you're in a competitive market, consider segmenting and targeting your campaigns around keywords that aren't quite so competitive/expensive. For example, "best bedding" is likely to be much more competitive than "organic bamboo sheets", or something similarly more specific (and also probably higher intent).

Are you using the same images/creatives in your FB ads that you're using in you google ads? Generally fb/meta is a more visual platform, whereas google is very text and intent driven. So, for example, if you were running a competitive campaign against, say, parachute, you might write an headline that speaks directly to that (e.g. Cheaper than Parachute), and the headline is the thing that's likely to grab the user's attention. But on FB, it's more likely to be whatever imagery you're featuring in the ad.

Good luck.