OP, I was a very senior travel consultant for over 35 years and had my own business for the last 17 prior to early retirement.
Unfortunately, it is one of those careers which appears pretty glamorous but realistically is very stressful. Customer expectations are extremely high nowadays and often unrealistic as the business has changed massively since internet booking became available. You are constantly reliant upon 3rd party suppliers - e.g. airlines, hotels etc. - not letting you down but unfortunately things often do go wrong which are completely beyond your control, e.g. strikes, inclement weather, suppliers going bust overnight, hotels mixing up confirmed reservations to name but a few. On top of all this you could do a huge amount of work over several days for a client only for them to then compare your quote with other agents, the internet etc. - as you have done all the work in advance it would only take other sources a few minutes to cost - and you end up losing the sale.
Agents are constantly undercut by tour ops, hotels, airlines etc. to avoid paying commission, (Airlines haven't paid commission for years now so any flight booked via an agent will include a service fee), and margins are very tight indeed so the financial rewards are not great at all these days. ☹️ Loads of my former colleagues have retired early, like me, or left the industry altogether and taken up a new career.
Finally, as someone has already pointed out, travel agents are on the decline. You can join a company as a non qualified agent but it would probably incur a huge joining/training fee and I certainly wouldn't recommend it. The responsibiIity is huge where even the slightest error/misspelling could cost you hundreds if not thousands of pounds.😱
I would stick with your enjoyable hobby and seek a more rewarding, supported career. 30 years ago I would have said totally different!