I understand and even though I do some paid work, it's completely different than the personal work I do and that seems to work well for me. If I had to shoot landscape or wildlife for money, I think I would go crazy as they are way too unreliable in terms of consistent results. It is nice when it's just a hobby and you are doing the work purely for fun, so I can understand that from your perspective.
As for the quality of your work, I think you're underestimating your skills. Several of the photos from the Ark and Iceland that you've shared in recent times have been excellent! Remember that the biggest difference between the people we see as pros and others is that these pros only share their best work. If you take a look at the outtakes or shots of subject matter outside their expertise from many of the best pros, you would be shocked at how many of their shots are just average or even poor. I'm not saying this in relation to your work, but what I'm getting at is that when you look over all of your work, think about the only best shots you've taken. If you do that, I think you'll realize that you have a portfolio of work to be proud of - and obviously you are continuing to add to that.