Do you also have limited time? We low budget you can try to go for time intensive channel. For example writing answer on Quora or being active in Facebook group is time consuming but free. Setting up an affiliate system is also cheap as you are paid on result. If you have a low budget I would strongly recommend to test max 2 channels at a time. Just run small & short experiments to test the potential, to not burn all your budget on one channel.

If you have a limited budget then you have to connect audience on social channels like FB, Twitter, Instagram and others. Connect with the right audience share your business information. Aware them of your brand and engage them through attractive posts. Social media is the best way to connect with the right audience without spending any single penny. You can do it by yourself if you have no budget to hire experts. It is very easy and free of cost way.

It really depends on what the startup does and who the targeted audience is. Let's take two examples. 1. A fashion startup: I would probably only use Instagram, Pinterest and TikTok. Create some content, but invest most time and money in connecting with influencers. 2. A startup in the creator economy: I would use twitter and some specific communities (like indiehacker). Connect with other creators who are potential clients. I would also create "launchable" content or tools every month and build a following here on producthunt. Like I said... there is no one answer... even less a correct one ;-)

i got a ton of users and interactions by simply making a reddit post in the relevant subreddits. It is free and really effective. If you have any questions about it feel free to ask :)

If you have limited then Social platforms, but I would recommend website too. There you can check your visitors audience and create a very specific content, you can monetize it too. To have a website visitor tracking tool is a must, so I will recommend Leadrebel too

This is what I am trying to do. A. I do weekly events (every Saturday 1-hour) with a small group of people. B. Create short content out of it that I can share for the week on Twitter, Linkedin, and the newsletter. D. Build community. Eventually, I hope I can create a repository of content that should help me with search engine visibility and market credibility. But honestly speaking, this consumes time. Not every day, I get sign-ups. And on those days, I feel like running an ad campaign, but I don't. :)

In my experience across startups, Google search is the best way for a startup to operate on a budget when it comes to marketing. Typically when your SEO strategy is on point, you can generate up to 60% of total traffic from Google search. This is huge. But it take some time. I'd focus there first and foremost, no matter the industry. Then from there, see where your potential customers are: if they spend more time on one platform or medium, that's the road to success (as long as you know how their consumption habits are changing over time). When in doubt, as your current customers about their journey to become your customer :) it always helps!