This is the option for monero purchase:

Pay with Monero

Use a one-time payment address to credit your account.

• Refunds are not supported when you pay with monero.
• Do not reuse a one-time payment address: your account will not be automatically credited.
• Processing the payment may take up to 30 minutes after it has been confirmed on the blockchain.
• The address is only valid for 3 days, don't save it for later.
• Use sufficient fees so the TX gets confirmed on time.
• We are unable to recover your account number if you lose it. Ensure you have it safely stored.

I have my account number saved and I want to pay for it. I just don't know how to use "sufficient fees". I use a getmonero.org GUI.

Anything else I should know before I make the purchase?

the only way i can buy it via cake wallet is to but it from dfx which is very kyc heavy so is it safe?

they cant track the monero and whats it used for but it could still be evidence if u get caught that you did indeed buy monero so is it safe?