I'm using shared hosting through ifastnet premium. I think that the problem is down to plugins which I am currently testing. I find that if I disable RankMath Pro I get a boost, and I've also disabled internal linking automation as well.Are you using shared webhosting, vps or what?
I have it going pretty good now as I've stripped out as much as I can. I'm still learning how to use Wordpress, so it's all a learning curve.
That's not to say that my hosting provider might be deliberately throttling me to get me to upgrade my account!