How to resize Kubernetes cluster?

We followed the starter kit to kick start our cluster and I have a couple of questions.

#1 We bootstrapped the cluster following this: However, initially created a cluster with 2 nodes.

What is the correct way to resize the cluster? Do I simply update the and apply the changes? Will it destroy anything in the cluster?

#2 After automating everything and having everything setup I took a quick look at the Compute Resource dashboard. Similar to this. And it appears that I am at 147% of CPU Limits Commitment before I even started. Digging a bit deeper, it looks like flus-system consumes up to 4 cpu’s. + ambassador up to 2. In our case, it is more than half of the cluster (we have a simple app). Of course, we can resize the cluster, but is that expected?

UPDATE If I try to update to 3 nodes and run: terraform plan -out priz_prod_cluster.out

I am getting the following error.

│ Error: Error retrieving Kubernetes cluster: GET 401 Unable to authenticate you
│   with module.doks_flux_cd.digitalocean_kubernetes_cluster.primary,
│   on .terraform/modules/doks_flux_cd/create-doks-with-terraform-flux/ line 39, in resource "digitalocean_kubernetes_cluster" "primary":
│   39: resource "digitalocean_kubernetes_cluster" "primary" {

All my keys and environment variables are updated and correct.

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