Accountancy fees vary enormously. In the not too distant past accountants, sorry Accountants, wore very good suits and charged huge rates. Nowadays some Accountants, sorry accountants wear jeans, and some of them don't charge very much at all.
There are three costs involved for accountants. Time, responsibility and regulatory burden.
The time involved for the basic work varies hugely. It depends on how much work your accounts person leaves undone. Some businesses process their accounts to a very late stage, others give their accountants bundles of invoices. Some even do lots of unnecessary work. It also depends on the complexity of the business. Your turn over might consist of dozens of invoices to each of several hundred customers every month, or just a few big ticket items. Similarly with suppliers. Some businesses have very detailed stock records, others very simple. This work really doesn't cost very much per hour to the accountant. If they were paying a trainee €10 per hour I would be surprised. They could charge you €15 for that or of course they could charge you €80.
By responsibility I mean the use of professional skill, judgement, experience. When the trainee has done all the work, an experienced accountant should consider the overall result. They may look at your file for an hour say, "thats all fine" and charge €1,000. Of course they may say, "there is a problem here", and they may as a result save you a lot more than €1,000.
Finally there is the regulatory burden faced by accountants. That is a real cost which is beyond your control and individually beyond the accountants, though why they dont collectively resist the burden is a mystery to me.
It is impossible to say if €6k is excessive. Tell your accountant you are concerned with the cost. Probe what your accounts person is doing and not doing. Ask if some change in their work could reduce the cost involved for the accountancy firm.
The year end half hour tele conference concerns me. Is that all the interest the accountants have in your business. Maybe they think it all the interest you have. Why are you not demanding a greater level of business advice. Any competent accountant should be able to talk for hours giving you business strategy advice after doing your years accounts. Some of that talk may be wide of the mark, but an outsiders perspective on your business should be invaluable.
In short, if you want cheap you are probably overpaying. If you want good advice and support, you don't seem to be demanding or getting it.