A basic website is fairly inexpensive and will do much more for your business than other marketing channels. A simple well-written one-pager / landing page will surely do the job to start with.
I’m always a little taken aback when business owners say that they don’t have a website. Your website is your online real estate. You control what’s on it, the layout, the design, the copy, the lack of ads, etc. Moreover, if you keep adding quality content, you can build your brand and your authority in your niche or sector. You’re also not subject to changes in social media algorithms messing about with your visibility.
The “top” is a managerial job. There are only so many to go around and many lower-level jobs.
Also, what guarantee do you have that a) the company will continue to grow and b) your career will grow with the company? I’ve always had my own business, mostly catering to B2B businesses. A commonality amongst all of them was that the manager liaising with me would be a decades-old employee for that company. I wouldn’t describe a single one of them as rich. Comfortable or well off? Sure. Rich? No.
And if you’re wondering how I can confidently say that, you can surmise that across several conversations at lunch, dinner, after work etc. Most folks are just happy that they have enough money to provide their kids with a decent education.
Betting on yourself and your own ideas is riskier but also entails better rewards in that same timeframe.