Actually, advice on how to enter on the WCA website is probably pretty useful, depending on where you are. In most places in the United States right now, registration space fills up very fast. With a competition I entered earlier this year, I had to sign up from a laptop through my phone hotspot because I was sitting in a car when registration opened, and I knew I had to move fast. The competition had 100 slots and I took 2 minutes to get registered - registration opened at 8:00 PM and I was registered by 8:02 PM. And I was the 100th person to enter, and the last person able to register for the competition without waitlisting. So basically you had to register within the first 2 minutes after registration opened to get in the competition.
So basically, in many cases, entering a WCA competition has become a lot like trying to get tickets for a major concert, except that the WCA website seems to work a LOT better than Ticketmaster LOL.
Usually checking the website for competitions once a week is plenty often enough. Usually they will announce a competition well before registration opens. When you see a competition you're interested in, go to the Register tab, and see what time registration opens. Then, just like you would for a popular show at Ticketmaster, make it a point to camp out on that page right before the time that registration opens, and if you don't see registration open at the moment it was supposed to open, refresh the page to make sure it lets you in. Then register as quickly as you can, providing payment information when requested. Make sure you are ready to enter payment information, since your registration generally doesn't hold your place until you make payment. So until your payment is entered, you are not considered registered.
I hope that helps you get in. I'm sure you will really enjoy a competition if you get to attend one.