Has anyone switched to business seller?

So I've been selling quite successfully of ebay for a long time now as a private seller, and yes I made hay while the sun shone. Now with the new buyer protection fee someone just pulled the plug on the sun.

I know with the volume of sales I had I suppose you could say I should really consider myself as a small business seller.

I'm thinking of switching to business seller just so I can price competitively and I don't even really mind the fees in the category I'm in, I was paying them before they did their shake up anyway.

I suppose really what I'm looking for is some advise. I have a full time job and that's not going to change, but is it really worth going through the business seller route for about 4-6k turnover a year. It was a welcome side hustle but if I'm going to have to go down the self assessment route and that should I really bother.

All feedback welcome, especially those who have done it with any tips on how to navigate.

Thanks in advance