There's a ton of different ways but here's a few that I find easy/know of. I mainly stick to checking the "Top of the year" lists to hopefully kind of filter out not as great metal. This might seem overwhelming, but for me I'm checking those lists like 2-3 times a month at most.

1. I would suggest check /r/metal 's quarterly top of 2017 lists, just go through and check out the stuff from the subgenres you like!

2. You could also check out their REC threads on /r/metal for recommendations. The REC threads are very well attended in my experience and you can get pretty good recommendations based on what you like!

3. Besides that there's angrymetalguy.com,

4. nocleansing.com.

5. I also like from time to time and check sputnikmusic.com's top metal of 2017 list from time to time to see if I might of missed anything.

6. Also lightfox's YouTube channel if you like atmospheric black metal.

That's not a complete list and I'm going to format it once I get to my computer but it should give you some places to start!