Should I register my website?

Hello,

I am interested in protecting my website using a trademark. I'm looking for registered trademarks of my name, name with spaces and domain name.

Looking at the different classes I would be looking at 16,35,36 and 41. I would still not need 25. This is looking on the GOV site for the United Kingdom.

Does anyone have any experience with trademarks? If yes, what trademarks should be used for a website related to business / marketing content?
SEMrush

I thought
35 – Advertising, business management and retail services.
36 – Financial and retail real estate services.
41 – Education, entertainment, sports and cultural activities.

Help would be appreciated!