Fair question, and I would rather answer it straight than pretend it is not the first thing every business owner thinks when a web designer shows up: social media is free, everyone is already on it, and plenty of businesses run a whole season off a Facebook page. If that is you and it is working, I am not going to pretend the sky is falling.
Here is the part that took me a while to put into words. The algorithm decides who sees your posts, and it changes without asking you. Your followers are not your list: you cannot email them, you cannot take them with you, and if your account gets locked, hacked, or flagged by a bot (it happens constantly, and there is no phone number to call), your entire marketing operation disappears overnight. You can be the best in your trade for thirty miles and still lose your reach to a password reset that never arrives. A website on your own domain is the one piece of your business online that you actually own: nobody can lock you out of it, delete it, or walk off with your customer list.
Marketplaces and platforms keep the relationship: the review lives on their site, the contact info stays in their system, and some of them take a cut of every sale on top. Repeat business is where a small business actually makes its money, and repeat business belongs to whoever holds the customer. When someone books through your site, they are yours: your list, your review, your next season.
Social media reaches people killing time on a couch. Google reaches people with money out, actively looking for exactly what you do, in exactly your town, right now. A Facebook page ranks for almost none of those searches (and half-abandoned ones look worse than nothing). Even the people who do find you on social go looking for your website before they spend real money: it is the trust check everyone runs and nobody admits to. No site, or a dusty template with last year's prices, and that sale quietly walks.
It answers the same three questions you are tired of answering, shows the prices so the tire-kickers screen themselves out, takes the booking, and collects the deposit at 11pm on a Tuesday while you are asleep. It does not call in sick, it does not need a day off in the middle of your season, and it never forgets to mention the thing you always forget to mention. Social media only does attention (the platforms call it engagement, which sounds like money but spends like applause). Attention is great, but attention has never charged a customer's card.
So this was never social media versus a website: they are not competing for the same job, and you want both. Keep posting. Social is the hook, out there getting you seen by people who did not know you existed yesterday. The website is the net, where the sale actually lands. Hook them out there. Land them somewhere you own.
More straight talk: should you build it yourself?, is SEO worth it?, and do you need a social media manager? Or read the whole series.